Seiko Cal. 3897 - 778

Seiko 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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seikata-wm-878b7cd9cdd3