Lot 30091 – 1913 Romanov Tercentenary 50k group of four bi-colour die proofs

1913 Romanov Tercentenary 50k group of four bi-colour die proofs, with the names of designer and engraver beneath the picture, some small thins, a rare assembly. Possibly from Tsar collection R. Lowe 1935 as described “50 kopecks: … Twenty-three bi-color die proofs in various colors …” published in the Yamschik-Post Rider 1983, No 12, page 15.