Coin used by spies to hide messages during the Hungarian War of Independence (1848-49).
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net/19c_spy_coin.jpg
Previously:
https://www.homemadetools.net/forum/...2769#post97090
https://www.homemadetools.net/forum/...973#post160439
https://www.homemadetools.net/forum/...613#post155434
https://www.homemadetools.net/forum/...314#post150434
https://www.homemadetools.net/forum/...599#post132599
https://www.homemadetools.net/forum/...960#post125012
https://www.homemadetools.net/forum/...348#post101352
