Seiko Cal. 0721 - 775

The 0721-775 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 0721 caliber with 36j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-e8cf928d9ae7]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Green

Jewels

36j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1978

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