This postcard of Pigeon Cove is not dated. The back side is undivided, which indicates it was produced sometime between 1901 and 1907.
The first building (the one that says Gloucester Electric on the side) has a sign on the front identifying it as Mason’s Pharmacy. Out of curiosity, I Googled the name and came up with the clip you see here from the Feb. 4, 1904, issue of The Pharmaceutical Era. “For the fourth time within six months,” it reports, “the drug store of Andrew J. Mason, Pigeon Cove, was entered by burglars.” (Click the excerpt to see the full page.)
The next building up bears the sign, “David Babson Co.” I can’t make out the type of business. Next from there, the sign says, “Edw. Bailey.” The white building has markings on the front that look like those of a barber’s pole. The building after that says, I believe, “Linen Store.”