Seiko Cal. 6646 - 691

This Spring Drive model from 1966 features a 46mm Titanium case. With its 20mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-07c91c359f27]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

White

Jewels

19j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1966

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