Seiko Cal. 5639 - 744

Seiko 5639-744

The 5639-744 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5639 caliber with 35j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-8fdd3008c69d]

Also known as: Sumo, Panda

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
11.8mm
Lug Width
18mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
90m
Dial Color
Navy
Jewels
35j
Frequency
21,600 bph
Power Reserve
61 hours
Year
1985

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