Seiko Cal. 5637 - 366

Seiko 5637-366

This Spring Drive model from 1969 features a 38mm Hardlex-Coated Steel case. Powered by the 5637 caliber with 31j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-58d28f95cf6b]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
12.9mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
70m
Dial Color
White
Jewels
31j
Frequency
36,000 bph
Power Reserve
42 hours
Year
1969

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