The Seiko caliber 7S36 is an automatic movement introduced in 1996 that is commonly utilized in Seiko divers and entry-level Seiko 5 watches. It does not possess the popular functions of hacking and hand-winding, which can be found in the upgraded caliber NH36 (aka 4R36) used in newer Seiko dive watches like the Orange Monster. The 7S36 offers essential functions including hours, minutes, central seconds, and a day/date calendar.