Lot 30061 – 1913 Romanov Tercentenary 20k die proof in black on card

1913 Romanov Tercentenary 20k die proof in black on card, with the names of designer and engraver beneath the picture. 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.