Lot 50623 – Switzerland, Winterthur – 1850 postmark, a composite

Switzerland, Winterthur – 1850 postmark, a composite glass support cliché for the P.P. postmark, in grey brown and with reversed image; featuring two prints of the postmark of which one is outlined by the stamp to indicate positioning, annotated “dépoli au papier verre usé” (frosted with sandpaper used).