Hello,
It should be this coin:
https://en.numista.com/catalogue/pieces105065.html
If you collect those pfennigs, the only available resource that I know of is Ruckser work that you can download from here
https://en.numista.com/numisdoc/numismatic-books-for-download-130.html#aut
You find your coin pp 77-78, Kärnten, Bernhard von Spanheim.
CNA I (Corpus Nummorum Austriacorum Band I) by Koch is the real reference but rare and expensive. I don't have it and as far as I know, no Numista member does.
Yours is quite nice and with your permission, I would like to use your pictures to complement our description. I try to put several examples of those pfennigs because they are often partially overstruck.
Best regards.
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