Seiko Cal. 5661 - 740

The 5661-740 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5661 caliber with 30j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-431207bf62cd]

Also known as: UFO, Rally

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1973

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