Colt ""Pinch Frame"" single action revolver. This is the Holy Grail of single action collecting. All correct revolver with factory letter and Ron Graham letter. Grahams letter describes the extreme rarity of this pinch frame revolver. Only about 160 pinch frames were produced and Graham states that the survival rate is very low. To quote Grahams letter The importance of serial number 58 and other known ""first shipment"" pinch frame single actions to Colt's history and to Colt firearms collectors cannot be overstated. Two other pinch frames have sold for $316,000 and $345,000 respectively. You can find a Walker, you can't find a pinch frame.