Seiko Cal. 6643 - 260

This Automatic model from 1975 features a 38mm Hardlex-Coated Steel case. Powered by the 6643 caliber with 29j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-fc0f957d1b56]

Also known as: Tuna, Helmet

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1975

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