I'm pretty sure the origins of your Stella Polaris bottle and stopper both lie in Italy.
I was a little confused about the R1 and R2 marks initially. I have seen an R1 mark on a veturipullo bottle before, however, there weren't any other indications that this may have been Italian as it wouldn't and didn't have the plastic stopper. After seeing your Stella Polaris decanter with a plastic neck to the stopper and the R1 mark, I am inclined to think the veturipullo bottle I've seen is also Italian in origin.
The more I look into this it is clear that a number of Riihimaki designs were either copied or reproduced from Riihimaki moulds in Italy, so far I can see at least five Riihimaki designs reproduced in Italy, however, I strongly suspect there's a few more out there waiting. Copies seem to include:
Sun vases (at least 2 sizes, many with made in Italy mark to base)
Stella Polaris decanters (usually plastic neck stoppers and possible R1 or R2 mark to base)
Veturipullo (R1 mark to base)
Emma decanters (again plastic neck stoppers and possible base markings)
Dice bottle decanters (again plastic stoppers to decanter, matching glasses with made in Italy marks)
Don't normally discuss values in detail, however, the Finnish originals would be more valuable, having said that the emergence of copies never generally helps the value of originals. This said I have seen the odd Italian sun bottle sell, and it did it did sell for more than I would have thought. The sun bottles are iconic Riihimaki designs and the originals can be expensive, so I can understand why some people would purchase similar and cheaper Italian versions.
The corks are original to certain bottles I think I can recall Finnish advertising showing these somewhere, however, these days most have long been lost.
Interesting to know about the Italian versions, no doubt there will be a few more to add to the list over time.