Seiko Cal. 4457 - 767

Seiko 4457-767

This Spring Drive model from 1977 features a 40mm Titanium case. Powered by the 4457 caliber with 31j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-0bb9fd108506]

Also known as: Sumo, Tuna

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
40mm
Case Thickness
11.4mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
100m
Dial Color
Navy
Jewels
31j
Frequency
28,800 bph
Power Reserve
43 hours
Year
1977

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