Seiko Cal. 6638 - 451

Released in 1969, the Cal. 6638 with design code 451 was part of Seiko's domestic market collection. Powered by the 6638 caliber with 33j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-ad768ad07278]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

33j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1969

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