Found a mini-mystery in the Vault. This image (BC 783) is listed as Felipe Alou, as a New York Giant. Alou did not break into the majors until 1958, the Giants' first year in San Francisco. He was signed in November of 1955 and I have not seen any information that would indicate that he was ever called up any time in 1956 or 1957 and that sure looks like the Polo Grounds.
It looks like it could be a young Alou. I can't match it confidently with any other New York Giants from 1956. Can some historian dig up when might have been suited up with the New York Giants or perhaps ID it as someone else?