Seiko Cal. 6639 - 372

Seiko 6639-372

The 6639-372 is a sought-after Solar piece from Seiko's golden era. Powered by the 6639 caliber with 24j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-608b4fde5a12]

Also known as: Bullhead, Sportsmatic

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
43mm
Case Thickness
15.6mm
Lug Width
22mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
70m
Dial Color
Navy
Jewels
24j
Frequency
28,800 bph
Power Reserve
44 hours
Year
1990

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