The registed magnums produced for KCPD were the largest quantity made. When they do surface most have been refinished and are missing stocks that number to the gun. There was a recent post about one that was rehabed by the current owner.
With the number produced they should be the easiest registered magnum to find but this may not be the norm.
The price as always is dictated by quaility of the gun and how bad the buyer wants it, there is one on Gun Broker that has post war stocks and has been relisted, did not make sellers reserve.
This is a KCPD registed magum refinished at least once.