Seiko Cal. 5641 - 690

Seiko 5641-690

The Seiko 5641-690 represents an important milestone in Seiko's 1973 lineup. Powered by the 5641 caliber with 17j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-3cf8b6b5df88]

Also known as: Bullhead, Navigator

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
14.6mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
150m
Dial Color
Burgundy
Jewels
17j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1973

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