I have seen three stamps with the coat-of-arms of Bosnia and different values in 'Heller' and 'Kronen'
which were described as being for playing-cards. They were supposed to be from 1899, and Bosnia was
under Austrian administration at that time. The values correspond to the contemporary Austrian tax values.
These were specimens and I have never seen them on cards.
The existence of the stamps is confirmed by the literature, and there were also sealing bands like in Austria.