Seiko Cal. 6630 - 748

This Spring Drive model from 1975 features a 40mm Titanium case. Powered by the 6630 caliber with 23j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-747310466370]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1975

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