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I don’t like using proprietary products because I don’t know what’s in them, and I believe VerdiCare is difficult to obtain in the UK anyway. After some research on what the British Museum used to use to treat bronze disease and verdigris on large objects, like cannon, I tried the technique for myself on this battered 1799 half-penny. For anyone interested, the treatment was 100 minutes at 90°C in a 2% w/w solution of sodium sesquicarbonate in chlorine-free water. Followed by a rinse in chlorine-free water to remove the chemical and then a rinse in acetone to remove the water. The heat is needed as the reaction is impossibly slow at room temperature.

Yes your spot on Paddy, although what about this one 😂

Something is wrong here I think. There shouldn't be any 1838 pennies? Are you perhaps looking at a halfpenny instead? Both farthings and halfpennies for 1838 exist. (The changeover from Copper to Bronze means the copper halfpenny is larger than the corresponding bronze halfpenny, so an easy mistake to make.) Check the dimensions and weight of your coin.

The other thing you have to consider is that what's left of the H has been artificially rubbed away on a worn penny in modern times, then the whole coin distressed in order to hide what was done.

A new unlisted unofficial farthing variety which landed today. I believe it relates to the famous gun makers Holland & Holland but I'm yet to research properly. Thoughts and comments welcome