Seiko Cal. 4478 - 691

The Seiko 4478-691 represents an important milestone in Seiko's 1973 lineup. Powered by the 4478 caliber with 21j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-89ec9ad919ec]

Also known as: Crown

Specifications

Movement

Solar

Case Material

Titanium

Case Width

46mm

Case Thickness

13.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1973

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