Seiko Cal. 6657 - 721

The 6657-721 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6657 caliber with 22j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-4d4fc9ee2593]

Also known as: Helmet, Arnie

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

34mm

Case Thickness

12.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Champagne

Jewels

22j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1981

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