Seiko Cal. 6638 - 228

This Hand-Winding model from 1991 features a 34mm Two-Tone case. Powered by the 6638 caliber with 25j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-98202340755e]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

34mm

Case Thickness

9.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1991

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