The uncle of one of my close friends passed away. He had a rather large gun collection that will be auctioned as part of an estate sale. Most are pretty uninteresting no-name double-barrel & single-barrel shotguns, but one Colt caught my eye. There's no description other than "Colt 45 cal. 1911 or 1915". There's an arched mainspring which makes me think it's a later pistol than that. Can someone tell me what I'm looking at? Sorry I don't have some better photos to post.