Seiko Cal. 6687 - 233

Seiko 6687-233

This Spring Drive model from 1966 features a 37mm Stainless Steel case. Powered by the 6687 caliber with 18j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-519d80c8cf5e]

Also known as: Monster, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
11.4mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
70m
Dial Color
Cream
Jewels
18j
Frequency
21,600 bph
Power Reserve
52 hours
Year
1966

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