Seiko Cal. 6131 - 637

Seiko 6131-637

This Automatic model from 1985 features a 40mm PVD Black case. Powered by the 6131 caliber with 23j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-b907b2d191b5]

Also known as: World Timer, Sea Horse

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
40mm
Case Thickness
8.3mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
80m
Dial Color
Black
Jewels
23j
Frequency
21,600 bph
Power Reserve
43 hours
Year
1985

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