This is the original replacement watch strap for the Seiko S23617 & S23621 Quartz Astron

This watch band / bracelet is suitable for the following model numbers:

S23617, S23621

S23617J1, S23617JC, S23621J1

This watch strap is suitable for the following case numbers:

9F62-0AD0, 9F62-0AF0, 9F62 OADO, 9F62 OAFO

Product specifications:

Brand: Seiko

Article number: DA431DC

Model number (s): S23617, S23621

Material of the watchband: leather

Color(s) of the watchband: black, black (stitching)

Width at fitting (Lug width): 20 mm

Width at the widest part of the watchstrap: 20 mm

Width of the strap at clasp-side: 18 mm

Band length: 125 - 175 mm

Shape of the wristband at fitting is: Straight

Watchband type: Stitched strap

Type of clasp: Fold-over-clasp

Material of the clasp: stainless steel

Color of the clasp: black

Seiko clasp-reference: B23S51SF00W

Type of case-pins: Springbar - (NOT included)

Seiko case-pin reference: S200BS - (See related products)

Print / version: crocodile

Other references: DA431 W 20 JAPAN - 2010 Limited 200 40th edition