1913 Romanov Tercentenary 10k vignette only final design die proof in black, thin at top, fine. Possibly from the Tsar collection sold by R. Lowe auction in 1935 – Lot 16 described as “10 kopeks: Die proofs of the final state of the head in shades of blue (4), green (4), brown (2), sepia (2), violet (1). ” published in the Yamschik-Post Rider 1983, No 12, page 14.