https://stamporama.com/auction/auction_main.php?action=40&id=RA1WscwRgawR6&cnt=91 BAVARIA
Thank you
If you are still interested : As far I can see it is most likely Mi nr 4 II The circle in the middle is not cut off on the edge. The outer brown line is sharp at the vertices and the thickness is irregular. So most likely Mi Nr 4 II Plate 3 (1858 - 1862)