There is an excellent reference on the coins of Hungary available for download in PDF format. The Coins and Kings of Hungary. Just do a search on you browser.
The first one is as mentioned a 1390-1427 Hungarian Denar under Sigismund of Luxemburg;Huszar 576,Unger 449c,Pohl 117-11. The dot over the shield is the mint mark. The other one as mentioned is under King Louis II with a K-A mint mark. Numista also has an excellent listing of Hungarian Denars.
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