Seiko Cal. 6646 - 309

This Automatic model from 1978 features a 40mm Titanium case. Powered by the 6646 caliber with 28j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-063a497ee151]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

40mm

Case Thickness

15.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1978

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