That would be correct per the TPS tables, but remember the TPS's authors' cautions about fully relying upon their findings from incomplete records. About the best you can say is that it is a rare and potentially unique gun. You can also put the word out and look for others, and if none, you can say that it is the only known one.
I am in the same situation with a couple of my Parkers and you don't want to overstate the matter.
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