Seiko Cal. 3897 - 778

The 3897-778 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3897 caliber with 29j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-878b7cd9cdd3]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Navy

Jewels

29j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1971

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