Info:Sotka caps are numbered on the back and also say "Original Cotka". There are at least 133 caps in the full series.
Thanks to Чугайнов Павел for sending me the scans of these caps. The first one has the word "Santa" written in his hair. The other cap appears to be a troll or something similar.
Sorry, we don't currently have any data on which countries this set was available to.