(1) The outline of Poland includes the eastern part which was annexed to the USSR at the end of WW2 (oblique shading), so I doubt it was done behind the Iron Curtain, to remind the Poles what happened there;

(2) I assumed STAN(ISLAUS) KUPOLSKI was the engraver's name, but parsing it "STAN KU POLSKI" yields "State towards Poland" in Google Translate--clunky, but fragmentary. The other writing I cannot read from the image, might supply missing grammatical context (e.g., "...Poland becoming a state");

(3) Speaking of "Google Translate," might not a better rendering of MILLE ANNOS AMORIS PATRIAE be "A Thousand Years of Love of Country"? 1966 is also regarded as the millennium of the Polish state. See this Wikipedia entry:
https://en.wikipedia.org/wiki/Christianization_of_Poland
#Millennial_celebrations_of_1966 . I leave that to Latin scholars to determine.

I also assumed STAN KUPOLSKI was the engraver because it was located in a logical, to me, spot for a signature. My feeling is that is more likely a medal for the millennium of the state rather than Christianity simply because it doesn't have a religious vibe to it. I know, that's not very scientific.

I just got a better look at the lower left writing on the medal. It says Lorioli .800. It looks like it is followed by a hallmark. A quick Google search directed me to an E-Sylum article from 1/29/2012 on Lorioli Fratelli. The article stated that they are a maker of religious medals which kind of contradicts my thoughts above. Finding the article got me to the website http://www.loriolimedaglie.it/ .

At the bottom the letters are VARISCO. I believe that may actually be the artist. There are a number of similar style medals on eBay.

So I have more answers now. I kept focusing on the Kupolski because it seemed like a name. Thanks to Chip for getting me off of that train of thought.

Can I assume that the .800 after Lorioli is the fineness? I honestly didn't think it was silver.

"fratelli" = brothers, in Italian. I was tipped off by that Italian website: "Fondata nel 1919 dai due fratelli Filippo e Michele" which I read as "Founded in 1919 by the two brothers Phillip & Michael..."