Seiko Bell-Matic 4006-7000 November 1966 Dolphin Caseback : r/JapaneseWatches
A Seiko Sportsmatic 5 Diashock automatic wristwatch, 1960's Dolphin back, on a Seiko calfskin strap
DIASHOCK 35 JEWELS: The Seikomatic 6218-8971 | Adventures in Amateur Watch Fettling
SEIKO Indonesia on Twitter: "True to its form, even the case back bears the same dolphin emblem as the 1965 original. Limited Edition Seiko Prospex #SLA017. #SEIKOID #SEIKOIndonesia https://t.co/fRbh6u9BT2" / Twitter