Lot
571 
Panama, 1915, 5c blue & black, center inverted, tied by purple "Agencia Postal, Panama, Feb 23, 1916" duplex on locally addressed cover; central vertical fold, otherwise Very Fine. Scott No. 210a Estimate $2,000 - 3,000.
ONE OF ONLY THREE RECORDED ON-COVER USAGES OF THIS PANAMA 5C INVERTED CENTER VARIETY.
Realized: $2,300