Greece & Montenegro Revenue Stamps On US Check 1925 & 1930

I need some help with these as I am not familiar with Greek or Montenegro stamps or revenue.
I looked in Scotts Classic and this forum and even ebay and didn't find anything that looked close. But I am sure I missed them somewhere.

The check was cashed in Montenegro so I assuming the stamp is from there.

So what do I have here? Your help is appreciated.

and what's the story with the check? I picked up 3 of the same type of check all from the same bank in Ely, Nevada, one with Canada revenue and these 2.
Maybe investment payouts? It was a mining town.

Hi.
On third picture : revenue stamp from Yugoslavia ( Kingdom of Montenegro was not independent in 1930 )
http://ephila-stamps.com/index.php/...a-1918-19141

And a great website for Greek revenue stamps :
https://www.yanstan.com/GREECE/REV/REVM.htm

Thank you very much Vayolene.

Here is my example, with barefoot catalogue number........
Yugoslavia 1927 Baefoot #90 Takesenamarka 50 paras.