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John SDavid is the expert regarding photos on this board...take his advice and if you are really interested his books are a must have. Crop marks on a photo often (but not always) are an indicator that it is a first generation photo. Use your eyes, 10x or greater magnification (a dot pattern indicates a copy), and other clues like paper stock to determine a photo's generation. The photo below is a first generation Ernie Nevers from 1925 (International News Photos). A copy of this photo (or possibly this one) was used to make Nevers 1955 Topps All American card.
