Seiko Cal. 6638 - 176

Released in 1969, the Cal. 6638 with design code 176 was part of Seiko's domestic market collection. Powered by the 6638 caliber with 25j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-ef937c5b3b41]

Also known as: Bullhead, Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

15.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1969

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