50 C. Chamber of commerce stamp, variety \"unperforated\", about French postal stamps for the 6 Fr. Postage supplemented mixed franking on cover from \"Ferel 3.5.1945\" in the fortress St. Nazaire to Herbignac, poste restante, arrival 4.5.45, to expiration the storage time redirected to La Baule with arrival postmark from 5.06.1945, expertise Lothar Herbst VP (2018) : \"the condition is perfect, there only the cheap additional franking Michel number 560 a little gum spots is and reverse the letter slight spots of the ink shows. The cancel Ferel with the adversity R cancel is very rare. Unperforated stamps are only approximate 100 pieces known and they are very rare. \", Michel 2.000.-