Lot 30074 – 1913 Romanov Tercentenary 35k die proof in blue and black with additional sideways black print of 15k vignette

1913 Romanov Tercentenary 35k die proof in dark blue and black with additional sideways black print of 15k vignette of Nicholas I, with the names of designer and engraver beneath the picture, small thin at top. Not listed in the Tsar collection sold at R. Lowe auction in 1935 – Lot 16. Probably unique.