60 C. Blue-violet with double and in each case inverted overprint \"fortress Lorient\", impeccable mint never hinged, issued only 105 examples - of it only a few with inverted, double overprint - extremely rare, signed Dr. Schmitt, dealers sign and certificate Herbst VP (2014) : \"the condition is perfect. \", provenance: collection Horst bolder (139. Dr. Fischer auction) - hammer price at that time 2.000.- Euro as well percentage of bid price!