Seiko Cal. 6638 - 185

The Seiko 6638-185 represents an important milestone in Seiko's 1965 lineup. Powered by the 6638 caliber with 19j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-e8dce3dee26d]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Green

Jewels

19j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1965

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