Seiko Cal. 6643 - 260

Seiko 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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