Seiko Cal. 5638 - 857

Seiko 5638-857

The Seiko 5638-857 represents an important milestone in Seiko's 1971 lineup. Powered by the 5638 caliber with 33j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-988677636f3b]

Also known as: Sea Horse

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
11.9mm
Lug Width
19mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
140m
Dial Color
Silver
Jewels
33j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1971

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seikata-wm-988677636f3b