Seiko Cal. 6650 - 904

The 6650-904 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6650 caliber with 29j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-b6a46d947bbf]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

29j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1976

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