Seiko Cal. 6638 - 727

The 6638-727 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6638 caliber with 33j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-534ee8bbb238]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1982

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