Denars from this period should have a legend around the double barred cross, and this one does not (unless it has been clipped off), so I think this could be a mid-15th century Hungary obol, like one of those listed below. The poor condition of the reverse makes it difficult to be sure: https://en.numista.com/catalogue/pieces51219.html (letter K on left side of cross might fit) https://en.numista.com/catalogue/pieces51234.html
Someone else may come along and nail down those two letters (including whether the image with cross is right side up ... I can't tell), which would help with a more definitive ID.
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