Please, if any one has time, I need help identifying this uniform. It’s my great-grandfather pic. It looks Austro-Hungarian to me but that white collar is really throwing me off.

To complicate things even more, he’s supposed to be Polish (wasn’t Poland under Russian control during WWI?). I’m pretty ignorant maybe this is a post WWI uniform but it’s definitely pre-1930.

Any help would be much appreciated thanks.

Oh, and as a bonus, if any one knows about labor camps Poles might have gone to during WWI era. My grandfather was in a POW camp where my great-great-grandfather worked at in some official capacity. The family story is that the gg-grandfather (Czech) packed up the prisoners and everyone left the conflict ridden area, eventually making their way to Brazil. The labor camp supposedly had to do with fishing.

I don’t expect any answers on the whole labor camp thing, I just thought I throw it out there since I’m doing the research.