The number of Parker Steel PH grades is much greater than 60. The stock books listed the PH as PT(plain twist). When the fluid steel barrels became standard on the PH, PB continued to use the PT in the stock book to identify the grade. They also wrote in "Black Barrels". These early black barrel guns were missed in TPS and the Serialization Book. Latter the PH grade guns were referred to as PS (Parker Steel). So, there are about 60 guns in the stock books with the PS reference. Austin and I worked on this many years ago. I believe there is some reference to this subject in an early PP. Mark
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