Seiko Cal. 5660 - 645

Released in 1975, the Cal. 5660 with design code 645 was part of Seiko's domestic market collection. Powered by the 5660 caliber with 23j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-4bea0dfc1602]

Also known as: Bullhead, UFO

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Burgundy

Jewels

23j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1975

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