To test for twin single tiggers, pull one, give the buttstock a firm tap on the floor and pull the other trigger. I do not think the single trigger was unstalled on the very early guns, but I could be wrong. I have a superposed with high 3 digit serial numbers and it has double triggers. There was a long discussion of the "P" in the serial number on another forum. The conclusion was that no one knows!!
There is no need to tap the buttstock on the Twin-Single to get the 2nd barrel to fire...at least neither of the two I had needed the tap.
Both of mine were mid 5-digit guns one in the low 1500s, the other the low 1600s.
Consensus on the "P" is that it does indeed mean Trap, with "C" meaning Field.
