This bookmark was made in the US by Jayo. It is marked with the makers hallmark, and Patent No. 163572. The patent is a design patent dated June 12, 1951 by Wesley M. Cowen and is titled Book Page Marker. An identical regular patent, No. 2,610,074 is dated Sept. 9, 1952 by Louis G. Meyers. The bookmark is a spring arm action where the clip part is attached to the cover or back binding and the arm holds the page.