Seiko Cal. 6640 - 463

The 6640-463 is a sought-after Solar piece from Seiko's golden era. Powered by the 6640 caliber with 29j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-72396d56408c]

Also known as: UFO, Emperor

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

8.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1967

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