Seiko Cal. 6681 - 163

This Solar model from 1975 features a 40mm Hardlex-Coated Steel case. Powered by the 6681 caliber with 21j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-7a30376c376f]

Also known as: Tuna, Crown

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

21j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1975

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