Seiko Cal. 5231 - 870

Seiko 5231-870

The Seiko 5231-870 represents an important milestone in Seiko's 1970 lineup. Powered by the 5231 caliber with 36j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-2ec329886fad]

Also known as: Shogun, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
13.1mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
40m
Dial Color
Black
Jewels
36j
Frequency
21,600 bph
Power Reserve
58 hours
Year
1970

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