Seiko Cal. 3891 - 993

The 3891-993 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3891 caliber with 33j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-1b422646a64b]

Also known as: Sumo, UFO

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

44mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Burgundy

Jewels

33j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1965

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