Seiko Cal. 6138 - 535

This Spring Drive model from 1990 features a 38mm Hardlex-Coated Steel case. Powered by the 6138 caliber with 29j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-31fbe349cf03]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1990

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