Lot 60887 – 1870, 1r rose, clear to mostly large margins, on cover

1870, 1r rose, clear to mostly large margins, tied by « Asunción/1871 4 May/R.P. » cds in blue to cover to Paraná (Argentina), with receiving cds on reverse; two tiny surface scuffs in the stamp of little significance as the majority of items known have faults; an attractive example of the very restricted group of genuine covers -fewer than fifteen- bearing this stamp, one of the difficult « Number One » stamps in worldwide postal history.