Seiko Cal. 3840 - 564

The 3840-564 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3840 caliber with 31j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-18f70885415d]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

31j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1968

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