Dear folks, I have a great pleasure to own this medieval silver coin. Unfortunately I don't know what is it. Likely Bohemian (it came from Central Europe) from the 12th or 13th century, but I'm not entirely sure. Weights 0.33 grams. In case someone can identify it please let me know what coin is this. Also, I would be very happy if someone could guide me to a usable online Czech medieval coin catalog. Thanks in advance!