VERY FINE. AN EXCEPTIONALLY RARE UNUSED EXAMPLE OF THE 1917 12-CENT PERF 10 AT BOTTOM. ONE OF ONLY FOUR UNUSED STAMPS RECORDED IN OUR CENSUS.
Our census of Scott 512b, available at our website at http://siegelauctions.com/dynamic/census/512b/512b.pdf , contains only twelve used and four unused examples of this rarity (including a pair).
Census No. 512b-OG-04. With 2013 P.F. certificate