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Brand: SEIKO
SKU: U4R3521B
Model(s): Compatible with SRP579, SRP873, SRPA71, SRPA75, SRPA95, SRPA73, SARY073, SARY109, SARY123, SARY125, SARY137, SARY161, SARY076, SAR126, SARY078, SARY128, SARY133, SRPK15, SRPK46, SRPK48, SRPB79, SARY085, SARY089, SRPC29, SRPC31, SRPC33, SARY097, SARY185, SARY205, SARY099, SARY141, SRRY025, SRRY027, SRRY041, SRRY028, SRP851, SRP850, SRP848, SARY103, SRRY033, SARY147, SARY149, SRRY045, SRRY047, SARY165, SARY167, SARY177, SARY179, SARY171, SARY169, SARY181, SARY183, SARY193, SARY195, SARY197, SARY223, SARY217, SARY219, SARY215, SARY208, SARY225, SRPK61, SRPK501, SRPL07, SRPL09,
Case Number(s): Compatible with 4R35-00B0, 4R35-00C0, 4R35-00D0, 4R35-00E0, 4R35-00F0, 4R35-00G0, 4R35-00J0, 4R35-01M0, 4R35-01N0, 4R35-01T0, 4R35-02C0, 4R35-02F0, 4R35-02N0, 4R35-02S0, 4R35-02T0, 4R35-02X0, 4R35-02Y0, 4R35-03C0, 4R35-03E0, 4R35-03L0, 4R35-03M0, 4R35-03P0, 4R35-03Z0, 4R35-04A0, 4R35-04B0, 4R35-04C0, 4R35-04E0, 4R35-04G0, 4R35-05A0, 4R35-05E0, 4R35-05G0, 4R35-05K0, 4R35-05Y0, 4R35-05Z0, 4R35-06E0, 4R35-06H0,
Color: Gray
Material: Composite
Size: 27.4 mm
Country of Origin:
HS Code:
This is the original replacement Movement for the SEIKO 4R35B Caliber 24 Jewels- Prospex & Presage - SRP, SRPA & SARY Prospex & Presage
Which SEIKO watches is this movement compatible with? (see the table below for the complete list of compatible model and case codes / numbers)
This watch movement / calibre is compatible with the following models:
SRP579, SRP873, SRPA71, SRPA75, SRPA95, SRPA73, SARY073, SARY109, SARY123, SARY125, SARY137, SARY161, SARY076, SAR126, SARY078, SARY128, SARY133, SRPK15, SRPK46, SRPK48, SRPB79, SARY085, SARY089, SRPC29, SRPC31, SRPC33, SARY097, SARY185, SARY205, SARY099, SARY141, SRRY025, SRRY027, SRRY041, SRRY028, SRP851, SRP850, SRP848, SARY103, SRRY033, SARY147, SARY149, SRRY045, SRRY047, SARY165, SARY167, SARY177, SARY179, SARY171, SARY169, SARY181, SARY183, SARY193, SARY195, SARY197, SARY223, SARY217, SARY219, SARY215, SARY208, SARY225, SRPK61, SRPK501, SRPL07, SRPL09,
Which SEIKO case numbers is this Movement compatible with? (see the table below for the complete list of compatible model and case codes / numbers)
This Movement is compatible with the following case numbers:
4R35-00B0, 4R35-00C0, 4R35-00D0, 4R35-00E0, 4R35-00F0, 4R35-00G0, 4R35-00J0, 4R35-01M0, 4R35-01N0, 4R35-01T0, 4R35-02C0, 4R35-02F0, 4R35-02N0, 4R35-02S0, 4R35-02T0, 4R35-02X0, 4R35-02Y0, 4R35-03C0, 4R35-03E0, 4R35-03L0, 4R35-03M0, 4R35-03P0, 4R35-03Z0, 4R35-04A0, 4R35-04B0, 4R35-04C0, 4R35-04E0, 4R35-04G0, 4R35-05A0, 4R35-05E0, 4R35-05G0, 4R35-05K0, 4R35-05Y0, 4R35-05Z0, 4R35-06E0, 4R35-06H0,
Product Specifications |
|
| Brand | SEIKO |
| Article number | U4R3521B |
| Type of Movement |
Automatic |
| Diameter | 27.4 mm |
| Thickness / Height | 5.32 mm |
| Functions | Hours, minutes, date, |
| Jewels | 23 jewels |
| Beat rate | 21.600 bph |
| Power reserve | Approx. 40 hours |
| Color | Gray |
| Material | Composite |
| Condition | 100% genuine, brand-new watch part, directly manufactured by Seiko. These are not aftermarket or refurbished components but original factory parts, ensuring a perfect fit and the highest quality |
For the latest product FAQs, please scroll down to the bottom of this product page.
(23 Jewels – confirmed by Seiko)
Important: B-series parts are NOT interchangeable with A-series unless identical code.
| Ref | Part Name | Part Code |
|---|---|---|
| 1 | Oscillating Weight with Ball Bearing | 050**** |
| 2 | Oscillating Weight Screw | 0012 354 |
| 3 | Automatic Train Bridge | 0191 183 |
| 4 | Automatic Train Bridge Screw | 0012 354 |
| 5 | Second Reduction Wheel and Pinion | 0514 183 |
| 6 | First Reduction Wheel | 0511 010 |
| 7 | Reduction Wheel Holder | 0836 002 |
| 8 | Pawl Lever | 0831 183 |
| 9 | Ratchet Wheel | 0285 051 |
| 10 | Ratchet Wheel Screw | 0012 919 |
| Ref | Part Name | Part Code |
|---|---|---|
| 11 | Barrel Complete with Mainspring | 0201 083 |
| 12 | Barrel and Train Wheel Bridge with Hole Jewel Frame | 0114 183 |
| 13 | Barrel and Train Wheel Bridge Screw | 0012 420 |
| 14 | Lower Plate for Barrel and Train Wheel Bridge | 0436 164 |
| 15 | Lower Plate Screw | 0012 354 |
| 16 | Sliding Crown Wheel Spring | 0363 183 |
| 17 | Third Wheel and Pinion | 0231 070 |
| 18 | Fourth Wheel and Pinion | 0241 010 |
| 19 | Escape Wheel and Pinion | 0251 300 |
| 20 | Center Wheel and Pinion | 0224 183 |
| 21 | Center Wheel Bridge | 0122 302 |
| 22 | Center Wheel Bridge Screw | 0012 354 |
| Ref | Part Name | Part Code |
|---|---|---|
| 23 | Pallet Fork | 0301 009 |
| 24 | Pallet Bridge | 0161 300 |
| 25 | Pallet Bridge Screw | 0012 354 |
| 26 | Balance Complete with Stud | 0310 197 |
| 27 | Balance Cock | 0171 353 |
| 28 | Balance Cock Screw | 0012 420 |
| 29 | Cap Jewel | 0011 221 |
| 30 | Cap Jewel Spring | 0015 703 |
| Ref | Part Name | Part Code |
|---|---|---|
| 31 | Cannon Pinion | 0225 414 |
| 32 | Minute Wheel and Pinion | 0261 183 |
| 33 | Hour Wheel | 0273 182 |
| 34 | Date Indicator Driving Wheel | 0802 183 |
| 35 | Intermediate Date Driving Wheel and Pinion | 0817 300 |
| 36 | Intermediate Wheel for Date Setting B | 0962 023 |
| 37 | Intermediate Wheel for Date Setting C | 0962 185 |
| 38 | Intermediate Wheel for Date Setting E | 0962 025 |
| 39 | Date Setting Wheel | 0737 183 |
| 40 | Date Jumper | 0810 183 |
| 41 | Date Disk Guard | 0808 183 |
| 42 | Date Disk Guard Screw | 0012 354 |
| 43 | Date Dial | 0878*** |
| 44 | Dial Holding Spacer | 4408*** |
| Ref | Part Name | Part Code |
|---|---|---|
| 45 | Setting Lever | 0383 183 |
| 46 | Yoke | 0384 183 |
| 47 | Setting Lever Jumper | 0388 177 |
| 48 | Setting Lever Jumper Screw | 0012 168 |
| 49 | Clutch Wheel | 0282 183 |
| 50 | Winding Pinion | 0283 020 |
| 51 | Winding Stem | 0351 200 |
| 52 | Balance Stop Lever | 0601 183 |
| Ref | Part Name | Part Code |
|---|---|---|
| 53 | Cap Jewel Spring (Escape/Third Wheel) | 0015 703 |
| 54 | Cap Jewel (Escape/Third Wheel) | 0011 221 |
| 55 | Train Wheel Hold Spring | 0015 703 |
| Ref | Part Name | Part Code |
|---|---|---|
| 56 | Main Plate | 0104 182 |
| Seiko Model Numbers List |
Seiko Case Numbers List
|
| SRP111J1 | 4R35-00B0 |
| SRP113J1 | 4R35-00B0 |
| SRP113JC | 4R35-00B0 |
| SRP115J1 | 4R35-00B0 |
| SRP115JC | 4R35-00B0 |
| SRP116J1 | 4R35-00B0 |
| SRP118J1 | 4R35-00B0 |
| SRP118JC | 4R35-00B0 |
| SRP119J1 | 4R35-00C0 |
| SRP121J1 | 4R35-00C0 |
| SRP121JC | 4R35-00C0 |
| SRP122J1 | 4R35-00C0 |
| SRP122JC | 4R35-00C0 |
| SARY005 | 4R35-00C0 |
| SARY007 | 4R35-00C0 |
| SARY008 | 4R35-00C0 |
| SRP101J1 | 4R35-00D0 |
| SRP103J1 | 4R35-00D0 |
| SRP104J1 | 4R35-00D0 |
| SRP106J1 | 4R35-00D0 |
| SARY001 | 4R35-00D0 |
| SARY003 | 4R35-00D0 |
| SARY004 | 4R35-00D0 |
| SRP107J1 | 4R35-00E0 |
| SRP109J1 | 4R35-00E0 |
| SRP109JC | 4R35-00E0 |
| SRP451J1 | 4R35-00F0 |
| SRP577J1 | 4R35-00G0 |
| SRP579P9 | 4R35-00G0 |
| SRP579PX | 4R35-00G0 |
| SRP579J1 | 4R35-00G0 |
| SRP580J1 | 4R35-00G0 |
| SRP873J1 | 4R35-00J0 |
| SRP875J1 | 4R35-00J0 |
| SRP877J1 | 4R35-00J0 |
| SRP872J1 | 4R35-00J0 |
| SRP868J1 | 4R35-00J0 |
| SRP870J1 | 4R35-00J0 |
| SRP866J1 | 4R35-00J0 |
| SRP864J1 | 4R35-00J0 |
| SRPA87J1 | 4R35-01M0 |
| SRPA89J1 | 4R35-01M0 |
| SRPA91J1 | 4R35-01M0 |
| SRPA93J1 | 4R35-01M0 |
| SRPA71J1 | 4R35-01N0 |
| SRPA71JC | 4R35-01N0 |
| SRPA71P9 | 4R35-01N0 |
| SRPA75J1 | 4R35-01N0 |
| SRPA95P9 | 4R35-01N0 |
| SRPA73J1 | 4R35-01N0 |
| SRPA77J1 | 4R35-01N0 |
| SARY073 | 4R35-01T0 |
| SARY075 | 4R35-01T0 |
| SARY109 | 4R35-01T0 |
| SARY123 | 4R35-01T0 |
| SARY125 | 4R35-01T0 |
| SARY137 | 4R35-01T0 |
| SARY161 | 4R35-01T0 |
| SARY076 | 4R35-01T0 |
| SARY126 | 4R35-01T0 |
| SARY078 | 4R35-01T0 |
| SARY128 | 4R35-01T0 |
| SARY133 | 4R35-01T0 |
| SRPK15J1 | 4R35-01T0 |
| SRPK46J1 | 4R35-01T0 |
| SRPK48J1 | 4R35-01T0 |
| SRPB79J1 | 4R35-02C0 |
| SRPB81J1 | 4R35-02C0 |
| SRPB83J1 | 4R35-02C0 |
| SRPB85J1 | 4R35-02C0 |
| SRPB86J1 | 4R35-02C0 |
| SARY085 | 4R35-02E0 |
| SARY089 | 4R35-02F0 |
| SRPC29J1 | 4R35-02N0 |
| SRPC31J1 | 4R35-02N0 |
| SRPC33J1 | 4R35-02N0 |
| SARY097 | 4R35-02S0 |
| SARY139 | 4R35-02S0 |
| SARY185 | 4R35-02S0 |
| SARY205 | 4R35-02S0 |
| SARY099 | 4R35-02S0 |
| SARY141 | 4R35-02S0 |
| SRRY025 | 4R35-02T0 |
| SRRY027 | 4R35-02T0 |
| SRRY041 | 4R35-02T0 |
| SRRY028 | 4R35-02T0 |
| SRP851J1 | 4R35-02X0 |
| SRP850J1 | 4R35-02X0 |
| SRP848J1 | 4R35-02X0 |
| SRP846J1 | 4R35-02X0 |
| SRP844J1 | 4R35-02Y0 |
| SARY103 | 4R35-03C0 |
| SRRY033 | 4R35-03E0 |
| SARY147 | 4R35-03L0 |
| SARY149 | 4R35-03L0 |
| SARY134 | 4R35-03M0 |
| SARY142 | 4R35-03P0 |
| SRRY045 | 4R35-03Z0 |
| SRRY047 | 4R35-03Z0 |
| SRRY048 | 4R35-03Z0 |
| SARY163 | 4R35-04A0 |
| SARY163J | 4R35-04A0 |
| SARY165 | 4R35-04A0 |
| SARY167 | 4R35-04A0 |
| SARY167J | 4R35-04A0 |
| SARY177 | 4R35-04A0 |
| SARY179 | 4R35-04A0 |
| SARY171 | 4R35-04B0 |
| SARY169 | 4R35-04C0 |
| SARY181 | 4R35-04E0 |
| SARY183 | 4R35-04G0 |
| SARY193 | 4R35-05A0 |
| SARY195 | 4R35-05A0 |
| SARY197 | 4R35-05A0 |
| SARY223 | 4R35-05A0 |
| SARY217 | 4R35-05E0 |
| SARY219 | 4R35-05E0 |
| SARY215 | 4R35-05G0 |
| SARY208 | 4R35-05K0 |
| SARY225 | 4R35-05Y0 |
| SRPK61J1 | 4R35-05Z0 |
| SARY235 | 4R35-05Z0 |
| SRPK50J1 | 4R35-06E0 |
| SARY239 | 4R35-06F0 |
| SARY247 | 4R35-06H0 |
| SARY249 | 4R35-06H0 |
| SRPL07J1 | 4R35-06H0 |
| SRPL09J1 | 4R35-06H0 |
Choose options
WatchPlaza is an independent retailer of watch parts and accessories.
For warranty repairs and official servicing, customers should contact their local authorized dealer or official service center.
Professional installation is recommended. Please verify calibre and reference before ordering.
Choosing a genuine SEIKO replacement part helps preserve fit, function and long-term reliability.
Genuine SEIKO parts can become harder to source over time, especially for older or less common references. When available, choosing the correct original replacement part can help maintain the intended fit and function of the watch.
Why choose a genuine SEIKO Movement ?
✔️ Genuine SEIKO parts are manufactured to meet the brand's original specifications for fit and performance.
✔️ Designed for the listed compatible references. We recommend verifying the calibre, case number and part reference before ordering.
✔️ A genuine original part is generally the most reliable choice when correct fit, finish and intended performance matter.
Availability and sourcing
➤Availability may vary by reference and supply.
➤ Certain watch parts may become limited or discontinued over time, depending on production status and brand availability.
1 to 21 days (varies by shipping method)
30-day return window
Beautiful deep teal-green glacial ice dial
The shroud took a little bit over a week to arrive, but it was pretty quick considering that I live in Australia, it came perfectly secured inside the packaging with the original Seiko part number label, super easy to replace and great quality. I hope that they stock them again soon to buy another one just in case I need it in the future.
Tuyệt vời
So I like to mess with beat up watches found on various auction sites. They are often sad and neglected pieces therefore I have several ‘go to’ suppliers that have the hard to find NOS items required to bring the watches back to life. The pic shows all those a bunch of Seiko’s that I’ve found over the last few months that have needed saving … I couldn’t have done this without the input from Watch Plazza. The Pepsi BFK is the one that this bezel was purchased for.
High quality oem dial
My old Seiko tuna 7549 from 1981 needed some love instantly . By missing of Original 7549 parts
I ordered in this shop :
Hand Set for sbbn015
Double Dome hardlex
Glass gasket
Kanji day Wheel for 7c46
With those original parts the 7549 was replaced and improved by an 7c46
Good to have trustful Shops like watchplaza to bring my old tuna back to modern Standard
Cool looking dial. Will definitely order again soon! 🤗
I like this pink matted Apple watchband very much. Glad that I bought STRPZ
This magnetic apple strap made of silicon is high quality. I would recommend it.
High quality and fast shipping!
The quality is better than what I bought before. The seller is highly recommended. The workmanship is +
Watch Plaza offer the seemingly unbuyable - replacement rubber straps for Seiko Arctura watches. Thank you WP - I'm enjoying my watch again, the strap fits and works perfectly - 😀
I bought this black leather strap with red stitching as a compatible replacement for my Seiko SNL021. The genuine leather felt comfortable from day one and softened nicely after a couple of wears. Stitching is tidy, and the subtle red detail picks up the chronograph accents without shouting for attention.
Fit and finish are exactly what I hoped for. The watch sits neatly on the wrist and feels refreshed—ideal if your original band is tired. At this price, the value is strong. It’s not an original Seiko part, but the quality feels solid and it looks right at home on the SNL series.
Pros
- Genuine leather; comfortable for daily wear
- Clean look: black with red stitching
- Good value at the current price
- Clearly labelled as compatible with Seiko SNL029, SNL021 and SNL017
Cons
- Needed a short break-in period (a day or two)
If you’re after a Seiko SNL029 strap or SNL017 watch band in this colourway, this compatible replacement does the job gracefully.
