Seiko Cal. 6643 - 157

Seiko 6643-157

The Seiko 6643-157 represents an important milestone in Seiko's 1978 lineup. Powered by the 6643 caliber with 30j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-304daf95a0e9]

Also known as: Bullhead, Sea Horse

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
37mm
Case Thickness
14.2mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
40m
Dial Color
Burgundy
Jewels
30j
Frequency
28,800 bph
Power Reserve
63 hours
Year
1978

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