Seiko Cal. 5661 - 547

This Quartz model from 1968 features a 37mm Two-Tone case. It features a Green dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-5fc89febc98e]

Also known as: Sumo, Bellmatic

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1968

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