New Depot, Mattapan Square Postcards New Depot, Mattapan Square No. 523 Postcard. Caption on front: New Depot, Mattapan Square, Mattapan, Mass. Published by The Novelty Art Co., Mattapan, Mass. Postally unused. On verso: Souvenir post card picturesque Milton, Massachusetts. Facebook Twitter Print Friendly Skills Depot, Dorchester, Mattapan, Mattapan Square Posted on November 24, 2022 ← Stewart Building View of Scarboro Pond →