Auction 333-341 Europe & Overseas Americas (North, Central & South America) - Day 1

1934: Air Post, 10 c. on 20 c. yellow-green, horizontal pair, unused, original gun, air surcharge error of overprint in black on left stamp 'Servicio Ceuntroamericano? (Instead of 'Cen'..), correct on the right stamp (Sanabia 146a & 146), fine example, scarce, believed to be unique Sanabia = $500+ in 1966. Ex the Brian Moorhouse Estate.