Commemorating the Opening of the World's First Fully Mechanized Post Office

✰✰✰ FIRST DAY OF ISSUE★★★ MECHANIZED POST OFFICE PROVIDENCE, R.I. Commemorating the OPENING OF THE WORLD'S FIRST FULLY MECHANIZED POST OFFICE Arf Craft UNITE OCT 20 9-AM 1960 OFFICE os ARTMENT VO AMERIC FIRST 1960 PROVIDENCE,R.I. OMATED POST OFFICE LN THE UNITED STATES OFISSUE