1947. The sub and the gusto with which Veronica is devouring it are strikingly at odds with the gown she’s wearing. Still, this is a hectic time for her and she’s presumably taking advantage of a brief break between filming scenes.
The movie identification stills number indicates that this shot is taken on the set of Saigon. According to IMDb, the stills photographer for the movie is Glenn E Richardson, who also works on Cecil B DeMille’s The Buccaneer (1938), Preston Sturges’ The Lady Eve (1941) and Alfred Hitchcock’s Vertigo (1958).