Seiko Cal. 3897 - 447

The Seiko 3897-447 represents an important milestone in Seiko's 1973 lineup. Powered by the 3897 caliber with 19j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-8267a7f3e340]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

90m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1973

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