1926 rare NOT RECORDED red cross stationery (PARO forerunner)

Rare “PARO forerunner” issued about 1926-1927. In journal Eesti Filatelist nr 18-19 (1976) Elmar Ojaste wrote in PARO-stationeries article that in Riigi Teataja 8/1926 was given permission to Red Cross to sell advertising covers which had 10mk stamps for 8 mk, and postcards which had 5mk stamp for 4mk. Then he asks is anybody seen such items. Well, here it is. I guess there was at least 8 different designs, I have seen 2, all have series number in left side (here “S. 7.”).

Note there is weak fold in the middle.