Seiko Cal. 6638 - 355

This Spring Drive model from 1979 features a 43mm Two-Tone case. Powered by the 6638 caliber with 17j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-2583b280f5d9]

Also known as: Pogue, Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1979

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