Island Monkey, newtoswitz thank you for the replies. The NN75 is what i was looking for!

In Sport Conrad the models look very uncomfortable (or better say "are not fit") for cross country skiing. I would prefer something without any hard plastic on the exterior (not to be picky, just for comfort).

With your help I now found manufacturers in CZ, UK (or China - not sure about the Decathlon's Inovik origin) and RU (Botas, Innovik and Spine), who still offers these shoes new. Will push them to sell me something.

Rotefella (NN75) standard was very widespread in the North America and Europe for many years and is still appreciated in some places.