Seiko Cal. 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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