Seiko Cal. 6640 - 527

This Hand-Winding model from 1980 features a 40mm Two-Tone case. It features a Silver dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-5637b39d187d]

Also known as: Tuna, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Silver

Jewels

17j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1980

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