I received these 4 coins as a gift
described as 4 Macedonian coins for further study
As per the pictures, they contain a significant amount of concretion
How do i remove it?
Ultrasonic cleaner, they all appear to be bronze smalls, less than 20 mm
on flattie, like a coin, the other 3 like thik like ingot casted then stamped while in the original mould
Thanking you in advance
Best regards Herman