Usually you can tell if skins are repop by how smooth they are. In my experience, original skins will not be quite as smooth to the touch and you may even be able to see some pitting with the naked eye even if they have been painted by a professional.......They do make repop glass cylinders now......I think the Sunoco globe in the picture is a repop. I don't think they were ever originally made in 13.5" lenses......The pump handle looks like a repop for a Wayne 515 not the 615 it is on.....Not sure how many pumps it would take to fill cylinder.

Jason Howard