Lot 30069 – 1913 Romanov Tercentenary 35k frame only die proof in green with white central vignette

1913 Romanov Tercentenary 35k frame only die proof in green with white central vignette, with the names of designer and engraver beneath the picture, showing plate pinning points, small thin, fine. Probably unique, no description in the Yamschik-Post Rider 1983, No 12, page 15.