Lot 30060 – 1913 Romanov Tercentenary 20k die proof in black on card, signed by V. Byuhner, dated “2/XII/11”

1913 Romanov Tercentenary 20k die proof in black on card, with the names of designer and engraver beneath the picture, signed by V. Byuhner, dated “2/XII/11”, crease at foot and a couple of glue spots clear of the design, probably unique. Possibly from Tsar collection R. Lowe 1935 as described “20 kopecks: … Eleven die proofs of the complete stamp in black in various stages of engraving …” published in the Yamschik-Postal Rider 1983, No 12, page 14.