This is the last of the set of 16. I got this one because I was curious about the oval marking on one side. The coin itself is in pretty poor shape and I can't make out much. The oval mark stamped on it looks like it starts with "VT" and then has 3 more lines of text. I had to tilt it to catch the light or nothing is readable. Other side below, but not much is distinct. Copper or alloy thereof, 24 mm, 3.40 g. Thanks for any advice.
Not a countermark, but rather, the recessed central cartouche from a 2 Granni of Sicily, as per below: https://en.numista.com/catalogue/pieces113408.html Yours appears to be 1782.
