This is the original replacement strap for the Seiko Stopwatch S321

This genuine Seiko band is suitable for among others the following case numbers:

8A20-0010, 8A21-0010, 8A20-001A, S141-0AA0, S321-4000, S038-4000, S033-400A, S039-400A, S032-4010, S321-4010, S031-4010, S321-401A, S321-401B, S351-4A00, S143-4A00, W610-5050, S024-6000, S025-6000, S026-6000 

Related models:

SAR003, SAR005, SAS001, SAR001, S23593J1, SAM001, S23921, S23293, S23295, SAM003, SAF001, SAF005