Jim
the only reason it is listed as a 1955 is because when it was put together thats the only model that was in production. They had to have some way to charge it out.
Its still a one of a kind made from all 1950 parts the barrel and cly are 1950 the frame is
a 4 screw from 1959. the grips are non relieved targets from about 1955.
But it is a great gun. In Skeeters book he talks about this gun and says it is one of the best shooting 45 colts he has shot.
Jim Fisher