Seiko Cal. 3813 - 664

The 3813-664 is a sought-after Quartz piece from Seiko's golden era. Powered by the 3813 caliber with 28j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-ef69e6f12d00]

Also known as: Sumo, Helmet

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

60m

Dial Color

Green

Jewels

28j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1991

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