Seiko Cal. 6637 - 775

Seiko 6637-775

This Automatic model from 1971 features a 39mm Stainless Steel case. Powered by the 6637 caliber with 29j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-0445c013a130]

Also known as: Helmet

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
39mm
Case Thickness
10.7mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
100m
Dial Color
Black
Jewels
29j
Frequency
28,800 bph
Power Reserve
42 hours
Year
1971

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seikata-wm-0445c013a130