I can't help you, but am interested in what it might be. Hopefully, some of the countermark experts will see this and be able to help BTW: I assume Paulo knows what the coin is, but for others that may be interested, it's from the German State of Saxony-Albertine
BRUNK wrote the catalog of COUNTERMARKS ON WORLD COINS. If you can find a copy look there. If you can not then look at the thousand countermarked coins currently for sale on ebay. Some look like your mark. If the seller has identified that variety your work is done. good luck
