WHat's a Colt 80? I'm not familiar with it.. The only thing I can think of is the Colt series 80, which is a 1911 with some extra safety mechanisms on the inside.. but it still looks like a 1911.
I can say the barrel part isn't directly from a Colt 1860, though the general lines are similar and likely inspired by it. The barrel assy on a Colt is relatively flat, rather than rounded and flush with the front of the cylinder.