Seiko 4R36: especificaciones y comparativa | Relojes.Wiki
Does this make sense? DIFFERENCES BETWEEN 4R36 AND 4R36A? The A indicates that it is the first generation of this caliber. 4R36 and 4R36A are the same, until Seiko releases a 4R36B
Seiko 4R36: especificaciones y comparativa | Relojes.Wiki