Kneitschel #22h, First to Fifth printings, 15c Blue, worn impression, vertically ribbed paper on both sides, which it looks like laid paper which is not listed in this issue, used with Buenos Aires c.d.s., very fine; 2009 Kneitschel and Solari certificates. (Image)

Est. $100-150

#167P, 1910 12c Blue plate proof on card, Inverted Center, a spectacular example with marginal imprint "...ía Sud-Americana de Billetes de Banco. Buenos..." and plate number, very fine, very few examples recorded of this variety, this being further enhanced by being a sheet-margin example. (Image)

Est. $300-400