Does Anyone Know Anything About This Serbian Stamp?

This has been in my wife's Croatian family for 3-4 generations. We've googled 'Kara George Stamp' but cannot find this particular stamp or portrait. TIA

Kara George Petrovic

I'm guessing some sort of charity label

Another charity label

Bosnia and Herzegovina (Serb Administration) Scott #29 issued 1994.

RioTemplestowe - your stamp is a voluntary tax stamp from the late 1930's. it is part of a set of 3, with the others showing St. Sava and a child in sailing uniform (symbolizing the Adriatic Guard Youth Organization). these were to help promote the National Educational Act.

redwoodrandy - your stamp is also a voluntary tax stamp from the same period. it is also available in red. these were used to help fund a Memorial to Karadjordjevic Petrovic. I say that it is from the same period (late 1930's) because the majority of the information I can find on these leads to this time-frame. Personally, I wonder if these were possibly earlier (mid 1920's) and used to fund the construction of St. George's Church "Oplenac", which holds the crypt of Karadjordjevic Petrovic.

Rio: welcome to the Forum !