I think if you tested its material, it'll lead somewhere (Though i'm not entirely sure of what tests you can do). Most coins from then seem to made of silver, some of copper. At least you'll learn more about it.
'10 Cents' isn't the proper currency of the coin either (Appears they used Mace and Candareen).
Weighting it will also narrow down the search and measuring it will further narrow the search.
