Yale Lock Man'f'g Co./Centennial Model Post Office/Stamford, Ct. Clear strike of rare circular handstamp (Bomar P78-02) on 1878 cover from Washington, D.C. franked with 5¢ Bank Note, cover addressed to the "Office of the United States Commission, Exposition Universelle" & backstamped with blue double circle "Universal Exposition, U.S. Commissioner, General's Office, Paris 1878", cover slightly reduced at left, Very Fine, a rare combination of markings of which only four examples of The Yale Lock circular marking are known. Estimate  $300 - 400. $0 (Image)

Yale Lock Man'f'g Co./Centennial Model Post Office/Stamford, Ct. Dateless duplex with target handstamp on 1878 cover franked with 5¢ Bank Note tied by blue cork cancel with matching "Cincinnati, O." cds at left, cover with printed address "United States Section of Education, Universal Exposition, Paris", backstamped with French "Exposition Universelle/Postes & Telegraphe" double circle Expo. postmark, Very Fine, a wonderful cover & one of the great Exposition rarities, only four examples recorded in Bomar. Estimate  $500 - 750. $0 (Image)

Yale Lock Man'f'g Co./Centennial Model Post Office/Stamford, Ct. Dateless duplex with target handstamp on 1878 cover franked with 5¢ Bank Note tied by cork cancel & "New Haven, Conn." cds, cover with printed address "United States Section of Education, Universal Exposition, Paris", backstamped with French "Exposition Universelle/Postes & Telegraphe" double circle Expo. postmark, Very Fine, a wonderful cover & one of the great Exposition rarities, only four examples recorded in Bomar. Estimate  $500 - 750. $0 (Image)