Seiko Cal. 6640 - 315

This Solar model from 1967 features a 37mm Two-Tone case. With its 21mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-6666e2082082]

Also known as: Turtle

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1967

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