Seiko Cal. 6138 - 820

This Spring Drive model from 1975 features a 40mm Titanium case. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-d540da5485c9]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Navy

Jewels

30j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1975

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