Huge vintage industrial stamped (see images) USA postal service pigeon holes. Larger than standard pigeon holes. Absolutely full of character and charm and a real statement piece. Latterly used in the UK by the Royal Mail. 
Extremely heavy one of a kind unit with great history and would work in any room for practical storage.  This is naturally a vintage unit that was used in a work environment so all areas show authentic signs of use. rust marks on the metal, a few dents and scuffs etc which we love and just adds to the patina in our opinion.
 
Height 192cm
Length 149cm
Depth 38cm