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davidcyclebackAll known reprints of N172 cards have a disinct dot pattern (usually multi-color dots but can also be black and white) under strong magnification. Examine the image of the player to see if there are dots.
The genuine N172 Old Judges have no printed dot pattern, as they are real photographs not ink-and-printing press cards ... A N172 has a real thin paper photograph pasted to a thicker cardboard backing. The fronts are often shiney, while the backs are matte (cardboard).
If you go with a good enough magnifying glass, you should have no trouble identifying any reprints.