Seiko Cal. 3813 - 904

The 3813-904 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3813 caliber with 28j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-67d402b0d919]

Also known as: Monster, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1998

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