A coin from the last days of the Ottoman Empire: Turkey 20 Kurush (Piastres) AH 1327 (AD 1909) Regnal Year 9 (AD 1917) Silver, 37 mm, 23.85 gm El Ghazi at right of Toughra (Sultan's signature) The coin has a mark on the reverse right which looks like metal has filled in the area. Is this a mint creation, error, or something else like jewelry work.
If I'm looking at the same place you are, I'm thinking that could be where something like a jewelry bezel or clip was soldered to the coin. Again, "could be ". Although, it could be a cud, since it is touching the rim. Again, "could be".