Seiko Cal. 6687 - 791

Seiko 6687-791

This Spring Drive model from 1966 features a 38mm Stainless Steel case. Powered by the 6687 caliber with 27j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-c3004d8938d4]

Also known as: Monster, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
38mm
Case Thickness
14.5mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
120m
Dial Color
Black
Jewels
27j
Frequency
21,600 bph
Power Reserve
62 hours
Year
1966

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