Bird delivering an envelope - sterling front bookmark. 3 1/2 inches. The front top design is marked sterling. The back is marked sterling front. I read that in thin items the base was a non-sterling alloy for strength and the sterling design was fused onto the base for shine and beauty. Pure (925) silver is fairly soft and would be easily bent or broken in a small thin piece. Explains the vent hole on the back to let heat escape during the fusing. Polished bright. Nice.