Switzerland, 1871 French Soldiers Internment Issue, black on purple "Gratis", cover free of postage, tied by "Luzern, 3.III.71" cds on cover to St. Galmier, France, various French transit and receiving backstamps, Very Fine and choice, a rare tied example of this Swiss Internment issue; with 1991 H. Renggli certificate. Zumstein No. 1. Estimate  $1,500 - 2,000. $0 (Image)