From this THR thread:
http://www.thehighroad.org/showthread.php?t=228425
"The old style Python barrel threads are .5634-32 threads.
These old style threaded barrels are identified by having TWO pins in the front sight."
"The new style Python threads are the same size as the Trooper Mark III/King Cobra.
These threads are .562-36 threads.
These new style threaded barrels are identified by having ONE front sight pin."


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