trial proofs on two original pages the famous Kurt Metzer collection with whose very exact description, beginning with the first piece from first original cancel with inscription post stamp instead of postal stamp on white cardboard paper (ex collection Meier, expertized Meier BPP and probably the only known piece), then single proofs of the number 1 and 3 with Guilloch similar frame, trial proofs of the number 8 in lilac-rose and bright gray ultramarine each in the block of four and a reprint miniature sheets of the number 6 in gray ultramarine from 1873. from the Kurt Metzer collection, 26. Walter Kruschel auction, lot 1030, surcharge at that time before closely 40 years 14500,- DM plus premiums