Seiko Cal. 6638 - 911

The 6638-911 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6638 caliber with 33j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-4c0073ad60e2]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Champagne

Jewels

33j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1966

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