Hopefully someone will come up with a easier answer then mine. I knew someone who did metal inspection and had one of the XRF non destructive testers. If silver the actual percentage would be off from the normal silver content it would mean plated. You might be able to call around and ask if you dropped by would they check it for you.
To me cleaning a coin like this is terrible. There are times when cleaning is needed like coins that have been dug up and have layers of dirt, but that should be done very slowly and with non abrasive material.
Can you weigh the coin? It does look odd. It does look like nothing has been removed since the cladding does seem intact. The rims appear 50 +% intact and if it were hit or run over to flatten it that much I wouldn't expect the coin to be round without edge dings. Or have any of the rims intact. I think I could duplicate the coin condition but it would be a pain. Grease filled dies comes to mind as a possible answer. A coin getting stuck after minting then another slug coming in on top of it is another is also a possibility. But really it would need to be looked at in person to tell if one of those. I'd hang on to it till you can get to a coin show hopefully with one of the grading companies and see if they can confirm.
Okay the coins I picked up in Sweden. Also a few I had already taking pictures of but forgot to up load to omni.
First the forgotten coins.
1965 Netherlands 1 gulden
1964 Canada 25 cents
1947 U.K. half crown
Now for the coins I picked up in Sweden
1744 Swedish 2 or (Bargain bin freebie)
1802 Swedish half skilling (Bargain bin freebie)
1822 Swedish 1 skilling (Bargain bin freebie)
1819 Swedish 1 skilling (Bargain bin freebie)
1804 Swedish 1\6 riksdaler
1807 Swedish 1/6 riksdaler
1566 Swedish 16 or
It's funny last week we were in Scotland and the age of buildings etc amazing. (This week we are in Stolkhom)
I don't have a 1511 but I have 1510 and 1509.
1514 Poland Lithuania half grosz Sisimund I
1513 Poland Lithuania half grosz Sisimund I
1512 Poland Lithuania half grosz Sisimund I
On price I contacted a seller that had several coins from the time and arranged a discount for buying 10 coins. got them for an average of 10 to 15 each