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identify7Sure, I did not intend to be mysterious here. But in honesty, this is not my expertise, I am a student. And I may just be one chapter ahead of you. The book I am on now is entitled "Judging the Authenticity of Early Baseball Cards" by David Rudd Cycleback.
Quite informative, well written, inexpensive, and a standard reference material in our hobby. Also written by a board member. Typically available on line for $20 or so; and also on the Internet.
But to answer your question, another technique used is microscopy. Which sounds a little sciencey but it really is only looking at the ink so closely that you can sort of see each spot. And what to look for varies with the card type. At all times it is best to use the approach you are fostering. That is, have a real card handy for comparison with that under investigation.
For this type of card (of which I have none to check), I believe what you would be looking for is more of a 3-D effect in the microdot pattern, coupled with a dark rim around each halftone dot and also on the lettering.
However, trying to make sense out of this abbreviated presentation, is probably impossible. I recommend again that you try a little, then come back and we can all try to stumble through this together.
Oh - the microscope to use is a little plastic pocket job which you can pick up for $25 or so on ebay and elsewhere. Mine has a battery operated light built in and a plastic switch to select the magnification: 60x, 80x & 100x. But I understand that a jewlers loupe is good too; and even smaller.
If however your interests are more in the realm of (as you asked) what to look for, I would seek out FKW or others whose perceptive powers are strong and who have familiarity with various sets. Me? I barely notice a fire engine bearing down on me. If it ain't big and bright and red with bells, flashing lights and a sireen, I wouldn't notice it. Heck, I really do not care much for these cards, am unimpressed with their appearance in general, and only really enjoy the history and set design. But I do want real ones, if I bother to pay for them.