Seiko Cal. 0721 - 551

The 0721-551 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 0721 caliber with 19j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-8ece8eb7f5fc]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

70m

Dial Color

Green

Jewels

19j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1970

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