What a great rifle! Congratulations on the buy.

Would you please post photos of the barrel flats, water table, and all barrel markings? That would help in providing background information.

fraserdouble is certainly correct. The ledger entry notes "A&D" for Anson and Deeley. Compare the "D" with the capital "D" on the next word, "Double". Same.

Do not try to put oil into the firing pin holes or other portals. You will just introduce harmful oil into the head of the stock. You can loosen the rear trigger by carefully cleaning the trigger blade (the part that goes up into the action) with a toothbrush and very light solvent, such as Kroil. Don't go overboard, and don't get it on the wood. You will see old crud slowly dissolve, and the trigger will free up.

I would never use Teflon as a substitute for paper or bullet lube.

Good luck, and keep us updated.

Curly