Seiko Cal. 0775 - 637

Seiko 0775-637

The 0775-637 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 0775 caliber with 33j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-7176a05085f9]

Also known as: Tuna, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
36mm
Case Thickness
14.9mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
40m
Dial Color
Silver
Jewels
33j
Frequency
36,000 bph
Power Reserve
53 hours
Year
1977

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seikata-wm-7176a05085f9