Seiko Cal. 6638 - 375

Seiko 6638-375

The Seiko 6638-375 represents an important milestone in Seiko's 1967 lineup. Powered by the 6638 caliber with 35j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-d4832ebe54df]

Also known as: Samurai, Bullhead

Specifications

Movement
Quartz
Case Material
Stainless Steel
Case Width
44mm
Case Thickness
8.3mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
110m
Dial Color
Cream
Jewels
35j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1967

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