Seiko Cal. 6639 - 274

Seiko 6639-274

The Seiko 6639-274 represents an important milestone in Seiko's 1992 lineup. Powered by the 6639 caliber with 36j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-ec9216d3e2a4]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
43mm
Case Thickness
14.5mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
36j
Frequency
36,000 bph
Power Reserve
44 hours
Year
1992

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