Seiko Cal. 6638 - 615

This Solar model from 1981 features a 37mm PVD Black case. Powered by the 6638 caliber with 17j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-ece03a868dce]

Also known as: Tuna, Emperor

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1981

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