Lot 50115 – X

Switzerland, Winterthur – 1850 2 1/2rp, two glass support clichés, one in negative, both displaying the part of the design being red in the original stamp, one with « cuivre sans verni » (unvarnished copper) notation and indication about the light « B.L. » over the screen which was used for the two minutes and thirty seconds exposure -2’30 »-, the example in negative dated November 1948 (horizontal crack); as well as one composite cliché proof on glass including two different P.P. postmarks, of which one framed by the area delimited by the shape of the stamp and annotated « dépoli au papier verre usé » (frosted with sandpaper used), a unique trio.