I have sometimes seen Old Garden Beach called by the name on this postcard, Headrock Beach. Perhaps the name is from the large, head-shaped rock that sits near the beach’s far end.
As you may be able to see from the texture in this image, this is a linen postcard. Postcards with this linen-embossed texture were popular from the 1930s to the early 1950s and often had vivid colors such as this.
This postcard was published by H. C. Brown Inc. in Gloucester. It was printed by Tichnor Brothers, a Boston publishing company that was in business from 1912 to 198. The card is postmarked 1950 but I have seen the identical card with a 1940 postmark. For that reason, I estimate its date to be roughly 1937.