Lot
1660 
France, 1871, Ballon Monté, The "Duquesne", franked with 1867, 20c blue (33) tied by light dotted star cancel on Ballon Monte lettersheet to St. Omer with "Gazette de Absents, No 21" enclosure; receiving backstamp, Very Fine; with 2015 Roumet certificate. Yvert No. 55. Scott No. BM55 Estimate $400 - 600.