Seiko Cal. 0721 - 551

Seiko 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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