Combined letter box and lamp post. Patented March 9, 1858, by Albert Potts, Philadelphia. [graphic]. Mailboxes--Pennsylvania--Philadelphia. Location: Third and Willow Sts. Wainwright retrospective conversion project. Select link below to view a digital image. Philadelphia : A. Easton's Litho 407, Walnut St. Philada., Printer Easton, Alexander, lithographer. 1858. Lithographs 1850-1860. 1 print : lithograph ; 29 x 23 cm. (11.5 x 8.88 in.) digitool:36333 http://www.lcpgraphics.org/wainwright/W076.htm Library Company of Philadelphia Print Dept. *W76 [P.2037] P.2037 Part of Wainwright Philadelphia Lithographs