Seiko Cal. 4538 - 641

The Seiko 4538-641 represents an important milestone in Seiko's 1977 lineup. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-b7e04351e4f2]

Also known as: Sumo, Bellmatic

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1977

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