I've have an old Colt revolver I got from a friend. I can find very little information about the gun. It has a nickle finish on it that appears to have been done later in the guns life. It does have some military inspectors stamps on the side plates. The but of the gun looks like it had a lanyard loop on it but that was removed or broken off. The gun no longer locks up tight and doesn't always advance the cylinder when the trigger is squeezed or the hammer is drawn back. Does this gun have any collector value or should I turn it in at the next police gun buy back?