Seiko Cal. 5637 - 485

This Hand-Winding model from 1978 features a 44mm PVD Black case. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-4a5ec506d061]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1978

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