Hi JayT,
thanks for your comprehensive answer.
You are absolutely right, I found out exactly what you wrote. It is easier to recognize hallmarks when you can compare them to the ones depicted in books!
So to summarize:
Date letter mark of a crowned P for 1786, with the date just beneath the crown: OK, exactly as you said. The P not perfectly readable but I could see the 86 numbers just beneath the crown!
-Discharge mark of a leaf with a circular border for 1786, which you have identified.:OK, it was the easiest to find that is why I only got this one :-)
-Maker’s mark, with the letter A visible on the right, maybe, and perhaps a C on the left. Could you sharpen the image of the maker’s mark or tell us what other letters or symbols you can decipher? I might be able to help identify the maker.: very hard to decipher. It might be an L on the left side and an A for sure as you said on the right side.
-By elimination, the charge mark could be the distorted mark in a reserve that looks like a grain of rice. To have concordance between these marks, the charge mark for 1786 should be an A with a circular border with a 6 between the legs of the A. Do you think you can make out such a charge mark?: absolutely right, I found the A with the circular border but the 6 is impossible to read. Let us consider it is a 6 ;-)
Warm regards.