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Cohan Circle
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Two intersecting circles. There exists a newer relative named Arusloky.

The puzzle consists of two intersecting circles. The distance between the centres is exactly one radius length. Each circle can beturned by 1/6th of a full circle. The circles are separated into a total of 19 segments and 10 triangles. The triangles all have the same color and can therefore be ignored.
The white piece is discoloured because of lubrication releasing the colours of the adjacent pieces. Lubrication is needed because the puzzle's pieces fit very tightly.
The solution booklet has a sticker on the front and on the first page replacing the original name of the puzzle with Cohan Circle. In one of the pictures you can see through the front page that the original name was "Magic Circle Puzzle"
The puzzle itself has no logo or writing except for "International patents applied for" on along the top on the front.
The US patent for the puzzle is US4580783, by Cohan Hooshang, filing and priority date 1984-10-23, granted 1986-04-08.

Almost 25 years later the production of a new version with identical mechanism but different colors started. This version bears the name "Arusloky".
Length: 124 mm
Width: 90 mm
Thickness: 8 mm

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Contributors

Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.

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