Silver Ruler Bookmark. This silver bookmark serves 2 purposes, as a bookmark and as a little ruler. The Silver Ruler Bookmark measures 4″ (10.1cm) in total and has ruler lines up to 8cm along one edge and up to 3″ along the other edge. It also has a tassel. This Silver 3″ Ruler Bookmark was made in a heavier gauge at 1.2mm thick. The ruler bookmark is fully hallmarked at has the `WRA` hallmark on which belongs to `William & Son`. William Asprey is part of the Asprey family. In excellent condition and never been used. Presented in a plain blue gift box.