1851
1928-34 Artigas definitives imperf printers proofs on thick white ungummed paper each in top marginal block of 4 all with circular security punch holes some with plate numbers in selvedge for 5m black 1c violet 2c green 3c olive-bistre 5c scarlet 8c indigo 10c orange 15c light blue 20c chocolate and 1p yellow-green SG542/43 545 547/48 551 553 556 558 & 566 proofs. ()
£10.00