This is the original black day disk for the Seiko 7C46 Marinemaster Professional 1000 m - 300m - Tuna and more. 

Contact us if you want to be sure this part fits your watch. 

Related case numbers:

7C46,0AA0, 7C46-0AB0, 7C46-0AC0, 7C46-0AD0, 7C46-0AE0, 7C46-0AF0, 7C46-0AG0, 7C46-0AH0, 7C46-0AJ0, 7C46-0AK0, 7C46-0AM0, 7C46-0AL0, 7C46-0AN0, 7C46-0AP0, 7C46-0AR0, 7C46-6009, 7C46-6010, 7C46-7008, 7C46-7009, 7C46-7010, 7C46-7011,

Related models:

SBBN001, SBBN007, SBBN011, SBBN013, SBBN015, SBBN017, SBBN019, SBBN021, SBBN031, SBBN035, SBBN037, SBBN023, SBBN027, SBBN029, SBBN039, SBBN040,