Seiko Cal. 5638 - 740

This Automatic model from 1976 features a 35mm Gold-Plated case. Powered by the 5638 caliber with 34j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-a6e3f7e8869c]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1976

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