You stumped me. I haven't seen a P1. How about posting a picture?

Three different decoders also came up unknown code. If your tag is corroded you may be reading R1 as P1.

Not all letters of the alphabet appear on row 2 of 68 tags. If you counted letters thinking they are all there, (the I and O are not), then a rusted out tag could understandably be misread as P1 not R1.

R1 is the Music Master Radio, 2 watts of power!

Picture please.

The 12 Scariest Words in the English Language: We are here from the Government and we want to help you. 1968 Plymouth Road Runner, Hemi and much more 1968 Dodge Charger, 318 and not much else 1958 Dodge Pick Up, 383 and loud 1966 Dodge Van, Slant 6 and cool