Reddhott, I believe the story is that the Philadelphia action bodies were used to make the first Sterlingworth Pin-guns in 1910 and 1911. I've never seen an actual Philadelphis gun, but I did see a Baltimore Arms gun (another, prior Ansley Fox endeavor) at a local gunshow a few weeks ago. I started to buy it for the Fox interest, but it was in too bad shape to do anything with...Geo