Seiko Cal. 6639 - 537

Seiko 6639-537

The Seiko 6639-537 represents an important milestone in Seiko's 1987 lineup. Powered by the 6639 caliber with 20j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-17ea079993bf]

Also known as: Silverwave, Golden Tuna

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
10.3mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
30m
Dial Color
Silver
Jewels
20j
Frequency
21,600 bph
Power Reserve
54 hours
Year
1987

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