I believe these photos are part of a series taken by Stanley Rosenfeld in 1947 about 1-2 months after Egret was launched. The originals are in the Rosenfeld collection at Mystic Seaport. Several were used in an article on Egret in The Rudder magazine, I think October 1947 was the date. One of them was also used for the cover shot of the magazine. All of them were shot in black and white.
I also beleive the original owner, Charles Porter Schutt had a scale model of Egret built. This was confirmed by my brother who said that he had seen the model in the model room at the New York Yacht Club.