Hoards of Celtic bronze coinage of the Strymon/Trident type from Bulgaria: https://www.academia.edu/16198777/P...ymon_Trident_Hoard_from_Southwestern_Bulgaria
Ummm, I couldn't access that link, but by any chance was it referring to these Celtic Strymon/Trident coins? Macedonian Under Philip V & Perseus (Celtic?) 187-168 BC Strymon & Trident
Yes. That's certainly one. Here's another link on those coins which should work: https://balkancelts.wordpress.com/2013/07/17/bandit-nation-the-bogolin-hoard/
Thank you. I had known that these were produced in the area of modern day Bulgaria, but this is the first I have seen hoard evidence that conclusively proves it.