Seiko Cal. 5664 - 721

Seiko 5664-721

This Automatic model from 1973 features a 38mm Titanium case. Powered by the 5664 caliber with 35j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-6d3b7f6a2b9c]

Also known as: Sumo, Bullhead

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
38mm
Case Thickness
8.2mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
190m
Dial Color
Green
Jewels
35j
Frequency
36,000 bph
Power Reserve
71 hours
Year
1973

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