Curiosities From Slovenaca

I hope you'll find these intriguing as I have.
Recently, I inherited an accumulation of stamps that hasn't seen daylight in nearly 80 years. While sorting through this amalgamation of 10,000+ pieces, I found these two from Slovenaca.
I have only been able to find information on one so far, the stamp with the wounded soldier. Apparently it is a military stamp issued in a very small number. But that's all I've been able to learn. I found an image of it on the web. The other I haven't yet seen anywhere else.
If anyone out there can guide or enlighten me, I will appreciate your insights. Thank you, and enjoy.

1921 Steiner Page 3.



Detail: (Click to enlarge)

Yugoslavia – The Kingdom of Serbs, Croats and Slovenes

SLOVENACA is Serbo-Croatian for Slovenes or Slovenians.

Look under Y in Scott or under J in some catalogs for Jugoslavia.

From a geographical angle, collecting Yugoslavia would be no less interesting than Germany and Italy with all the border changes over the course of the last 180 years or so