The Yale Lock Postal Bureau/Section des Etats Unis/Exposition Universelle/Paris 1878. The Yale Lock Postal Bureau/Section des Etats Unis/Exposition Universelle/Paris 1878 blue boxed handstamp (Bomar P78-01) on 1878 cover from Germany to the "American Section of the Paris Exposition", franked with two 10pf tied by "Dortmund" cds's, backstamped by French double circle postmark of the Expo., cover with some light staining at top, Very Fine, an unusual usage from a foreign country other than the United States. Estimate  $300 - 400. $0 (Image)

The Yale Lock Postal Bureau/Section des Etats Unis/Exposition Universelle/Paris 1878. Blue boxed handstamp (Bomar P78-01) on 1878 cover of New Jersey firm at the Expo. with printed corner card "Exposition Universelle/American Section", addressed to London franked with three French 25c Sage (one with perf flaws) tied by French "Exposition Universelle/Postes & Telegraphe" double circle Expo. postmark, Very Fine, a wonderful cover. Estimate  $300 - 400. $0 (Image)

The Yale Lock Postal Bureau/Section des Etats Unis/Exposition Universelle/Paris 1878. Blue boxed handstamp (Bomar P78-01) on 1878 cover from England to the "American Department, Paris Exposition", franked with 2½d tied by "London" duplex cancel, backstamped by French double circle postmark of the Expo., Very Fine, an unusual usage from a foreign country other than the United States. Estimate  $300 - 400. $0 (Image)

The Yale Lock Postal Bureau/Section des Etats Unis/Exposition Universelle/Paris 1878. Clear strike of boxed handstamp (Bomar P78-01) on 1878 cover from Washington, D.C. franked with 5¢ Bank Note (one blunt perf), cover addressed to the "Office of the United States Commission, Exposition Universelle" & backstamped w light strike of blue double circle "Universal Exposition, U.S. Commissioner, General's Office, Paris 1878", Very Fine, a rare combination of markings. Estimate  $300 - 400. $0 (Image)