I thought I would try my hand at some detective work on this one and when I googled it I found someone else has already asked about a different valued stamp from the same country and the thread for it with the answers others from the forum had found can be found here.........https://goscf.com/t/12937 Hope this helps out.
The paper is quite often referred to as 'pelure' paper. Some call it 'onion skin' paper. This type of paper was used on a lot of the pre East Germany regular stamps, or more commonly referred to as the "Pre Soviet Forerunners"
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