Seiko Cal. 6131 - 337

This Hand-Winding model from 1971 features a 44mm Hardlex-Coated Steel case. Powered by the 6131 caliber with 27j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-1a2e6a3851ea]

Also known as: Monster, World Timer

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

27j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1971

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