Seiko Cal. 6643 - 111

Seiko 6643-111

The Seiko 6643-111 represents an important milestone in Seiko's 1977 lineup. Powered by the 6643 caliber with 28j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-8aa08660715d]

Also known as: Tuna, Helmet

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
14.0mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
160m
Dial Color
Green
Jewels
28j
Frequency
36,000 bph
Power Reserve
42 hours
Year
1977

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