Dorchester High School Postcards Dorchester High School No. 340 Postcard. Caption on front: Dorchester High School. Postmarked Dec 7, 1906. With one cent stamp. On verso: 1250 The Metropolitan News Co., Boston, Mass. Manufacturers of Souvenir Postal Cards. Facebook Twitter Print Friendly Skills Codman Square, Dorchester, High School Posted on November 19, 2022 ← Birds Eye View of Bridge & Drive, Franklin Park Savin Hill Bathing Beach →