I own P 420 and this what I was told when I asked a similar question of Richard Skeuse. 
 
Hi Don, Thanks for your question. The P guns were Prototypes that were the first of many Parker Reproduction guns made. 
 
The only difference I am aware of is the P prefix.  Value seems to be similar to any of the other repro given the same condition and configuration. Some might be willing to pay more for them but I am not aware that it is a significant amount
		 
		
		
		
		
		
		
			
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				May you be blessed with plentiful game in the fields, the time to hunt, a good bird dog in front of you, a Parker in your hands and friends to share the adventures with.
			 
		
		
		
		
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