Seiko Cal. 5231 - 437

Seiko 5231-437

This Quartz model from 1988 features a 40mm Hardlex-Coated Steel case. Powered by the 5231 caliber with 22j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-1a5b5ee80b05]

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
15.2mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
150m
Dial Color
Silver
Jewels
22j
Frequency
21,600 bph
Power Reserve
37 hours
Year
1988

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