1584 Hungary Rudolf Silver Denar, Poor Condition

#2011-1039 in HB1. Appears to be some chemical on the coin. Please see notecard from Forum Ancient Coins for details. They valued this at $16. Slava Ukraini! Please note, I'm not a dealer or business, I'm simply selling my collections and don't trade, meet or deliver. Purchases may be picked up in the lobby of my building at Broadview/Pottery. Items may be shipped but I don't pay postage or accept responsibility for loss. Thank you.