W517 and W560 are heavily reprinted.
W517-2 is found either cut from a 4-in-1 postcard, or from a vertical strip, but if cut close to the image its tough to tell the difference.
If you look at the back card stock color on the W517 its easy to tell the difference from the reprints (the reprints also originally say "W517" in bottom corner but this is either scuffed off or cut off)
On the W560 the image clarity (contrast) is the key on the reprints. The only reprints Ive seen on the W560s are a single color kind (red or black). The scarcer 2 color kind (red and black) hasnt been reprinted.
google images is the best way to compare them.
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