Seiko Cal. 5637 - 380

The Seiko 5637-380 represents an important milestone in Seiko's 1981 lineup. With its 20mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-99cd89e1cc19]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Champagne

Jewels

35j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1981

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