@galba68 - It is always exciting to click on your new threads to see what you have found! So fun. Congrats.
It's an officina mark: the coin is from the Gallienus zoo series, with a left-facing gazelle and the DIANAE CONS AVG reverse legend, produced by the 12th officina.
Very nice. I always enjoy these threads of yours. I hope that one today you will find yourself a nice Galba denarius.
While Donna is certainly right, it is important for beginners to realize that the 'rules' changed many times in the many centuries that coins were made and in the various mint cities so not every number you will find in the same place on a coin will mean the same thing (officina) as here. Many of us appreciate the fact that there is always something more to learn about our coins. Any good answer to a question will suggest at least two more questions so you need to get used to discovering other things that you simply do not know. In this case, the coin below has PXV in honor of Gallienus' 15 year in the office of Tribunica Potestas. Here VIIC records his 7th Consulship. Coin Talk has quite a large number of people happy to help those just starting (on only fifty years into) their journey of numismatic study. Ask!
Great finds, @galba68. Always look forward to what you've found, and love to see them after they're cleaned. Keep digging, it makes my day!
