Seiko Cal. 5639 - 550

This Hand-Winding model from 1978 features a 34mm Hardlex-Coated Steel case. With its 21mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-dd07d79eea67]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1978

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