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<p>[QUOTE=&quot;Npk2019, post: 629055, member: 10874&quot;]It is 4.675&quot; diameter .375&quot; thick. Inner circles are 1&quot; diameter. Found in northeast Ohio USA. </p><p><br /></p><p>We thought it was something for a projector however the four circles with patterns are completely opaque. </p><p><br /></p><p>There are words inscribed around the edge that coincide with each of the 8 circles. There is OPEN, (4) OBJECT that coincide with the symbol drawings, N for the blue disk, S for the yellow disk, and D for the purple disk. </p><p><br /></p><p>The back side of the 1&quot; circles have a fine pitch thread.[/QUOTE]</p><p><br /></p>

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