Seiko Cal. 4561 - 640

The Seiko 4561-640 represents an important milestone in Seiko's 1977 lineup. Powered by the 4561 caliber with 23j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-ead4fca39baf]

Also known as: UFO, Flighty

Specifications

Movement

Solar

Case Material

Titanium

Case Width

38mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1977

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