Take the grip screws and see if they smoothly thread into the holes, (that is what they are for, so you don't lose the grip screws). Although the look ok, The checkering seems to lack crispness and the radius around the relief cut for the magazine release looks odd.
One test you can do is to heat up a pin and press it into the back of the grips, someplace where it will be the least noticeable. If it smokes and lets off an odd odor, they are bakelite. If it bubbles and smell like burnt plastic, then they are, well, plastic.
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