Seiko Cal. 0731 - 641

Seiko 0731-641

Released in 1992, the Cal. 0731 with design code 641 was part of Seiko's domestic market collection. Powered by the 0731 caliber with 29j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-d5e9f4ff03b7]

Also known as: Sumo, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
38mm
Case Thickness
9.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
160m
Dial Color
Burgundy
Jewels
29j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1992

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