[drcy]

News photos were sometimes mounted to cardboard. If the image is sharp and clear and it came from a newspaper, it could be original. Just from the pic you posted, it looks first generation clear. It was common to put a newspaper clipping on back, but it was usually the real newspaper clipping not a Xerox copy. They often also have various cataloging numbers and writing on back. I doubt an auction house would write numbers on back.

If it's original, it's probably worth several hundred dollars. Who knows, maybe more. If it's a genuine news photo but from later, it would still have value. It will be hard to judge if it's original with it pasted to the board, but the clarity of the image is a sign. If the other photos are mounted in the same way and from the same period, that would support the age. Circumstantial evidence.