Seiko Cal. 6637 - 916

This Automatic model from 1974 features a 43mm PVD Black case. Powered by the 6637 caliber with 33j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-761ca3bd1791]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

33j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1974

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