Thanks, Dfariswheel. My old Colt is likely past fixing; the hammer cocks in sa mode and falls with the trigger being pulled but the da mode doesn't work. There is little rust but the original nickel finish has "left the building" for the most part. The fragile "Gutta Percha" grips, on the other hand, are in good shape and might be worth more than the gun if I were ever to "part it out".
But, the old Colt was my grandfather's and it gives some character to the wall it hangs on.