No. 15383 Barden Cream carriage with Edward Stern in front.
Richard T. Barden,
From Maine Genealogy online
Richard T. Barden of Dorchester, Mass., married Mary Foley (born in Bath, Maine) on June 4, 1919.
The Boston Register and Business Directory, 1918, has an entry for Richard Barden in the Creameries category on p. 587 with address 339 Codman Street
The maps do not indicate Barden as an owner, and in the 1918 and 1933 maps, no. 339 seems to be simply a house lot.