Lot
1573 
Azerbaijan, 1922, 500,000r on 2,000r blue & black, top margin horizontal strip of six, tied by "Baku, 9.12.22" cds's on reverse of registered cover to "Wien, Austria", front with registry etiquette (flaws), F.-V.F., a very scarce franking. Scott No. 51 Estimate $300 - 400.