Seiko Cal. 6378 - 591

The 6378-591 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6378 caliber with 35j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-cebaee40190c]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1985

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