This view of Old Garden Beach was published by Virginia Cleaves Little. She took over the Rockport Photo Bureau after her father, Charles Cleaves, died in 1937. She was active publishing her own images until at least 1946.
This linen postcard is not dated or postmarked. I am estimating the date to be around 1945.
Note the tower in the background. My guess is that the tower was the life saving station at Gap Cove, but it seems taller than any tower I’ve seen there.
Vintage Rockport 
I believe that tower is the 150 ft antenna on the grounds of the life saving station.It was built around the late 40’s early 50’s.
Paul
Thanks Paul.
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I remember a very tall tower at gap cove. I have a picture of it being taken down, which doesn’t show how big it is because half of it is gone. I will try to find it.