Seiko Cal. 6641 - 103

Seiko 6641-103

The 6641-103 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6641 caliber with 29j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-3ef42a1f1350]

Also known as: Tuna, Helmet

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
43mm
Case Thickness
8.9mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
110m
Dial Color
Black
Jewels
29j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1968

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seikata-wm-3ef42a1f1350