Seiko Cal. 7131 - 339

Seiko 7131-339

The Seiko 7131-339 represents an important milestone in Seiko's 1987 lineup. Powered by the 7131 caliber with 29j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-e9b727afc738]

Also known as: Sumo

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
41mm
Case Thickness
14.3mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
50m
Dial Color
Cream
Jewels
29j
Frequency
21,600 bph
Power Reserve
49 hours
Year
1987

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