Seiko Cal. 6660 - 740

The Seiko 6660-740 represents an important milestone in Seiko's 1966 lineup. Powered by the 6660 caliber with 35j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-3baee4032191]

Also known as: Emperor

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1966

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