Need help identifying antique gun
This was my Great-Grandfather's gun, possibly from Italy. It has an ornate letter H (with fleur-de-lys sprouting from the crossbar of the H) within a square and the sides of the square are slightly curved, which is located on the upper part of the handle. The handle closely resembles the Webley Mark IV .455 in design with the notable diamond shaped ornament surrounding a screw. The cylander is a bit different from the photos I've seen. There is a letter P on the gun just forward of the cylander. The barrel is octogonal. The cylander is marked with the number 89.
I don't know what else I can say. Any advice, help would be appreciated.
Note: to me the gun is quite small, particularly the handle which measures not more that 2 and one half inches. I thought it might be a "ladies" gun but it is quite heavy nonetheless.