Seiko Cal. 6641 - 370

The 6641-370 is a sought-after Hand-Winding piece from Seiko's golden era. With its 21mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-46eb7db3bd16]

Also known as: Sumo, Arnie

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1979

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