Seiko Cal. 6640 - 316

This Spring Drive model from 1995 features a 39mm PVD Black case. Powered by the 6640 caliber with 27j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-a24a28c67bba]

Also known as: UFO, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1995

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