Seiko Cal. 6645 - 661

This Quartz model from 1977 features a 42mm Two-Tone case. It features a Green dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-4410cfe20092]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

42mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1977

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