taoish, 
A proto-coin (ROMAN REPUBLIC: AE aes rude, 45.24g, before 4th century BC) is listed for an upcoming auction with a museum number written on the side.
The number looks like "L-1900-III".
Any numismatists or museum folk intrigued?
https://www.numisbids.com/n.php?p=lot&sid=7077&lot=1700