1873 Post Office Department Official Announcement of Postal Cards, April 15, 1873 circular to Postmasters from the Office of the Third Assistant Postmaster General announcing the issuance of Postal Cards to postmasters in May 1873 as authorized by the June 8th 1872 Act of Congress; file folds, Very Fine and scarce. Estimate  $750 - 1,000. $0 (Image)