If you want a Roman coin the safest way is to get one from the UK, where they have the PAS (portable antiquity scheme) in place for legal finds. You can definit

If you want a Roman coin the safest way is to get one from the UK, where they have the PAS (portable antiquity scheme) in place for legal finds. You can definitely find a coin with a PAS number and be confident it isnt looted. There is really no other good way, though. Most digs don't sell the artifacts and coins don't come with documented find spots; at best you can buy very expensive ones that were published around 140 years ago for sale, but that isnt a guarantee that the coin wasn't originally acquired fully legally