Seiko Cal. 4421 - 907

The Seiko 4421-907 represents an important milestone in Seiko's 1977 lineup. Powered by the 4421 caliber with 17j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-eb10e0f58e08]

Also known as: Silverwave, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Navy

Jewels

17j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1977

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