Robert
I think these are the makers marks of the modern/repro die sinkers. I'm sure that none of these markings appear on the original Birmingham minted Tavistock pennies of 1811. The original pennies are not that rare but normally turn up in fairly worn condition compared to many of the other 1811 series of commercial pennies.
It is common for repros. such as the ones being made by Bidbury to have some form of makers or repro. mark on them to stop them being passed off as originals (as can happen).
Regards
Mark Smith
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