Real grips are molded under pressure so there should not be air bubbles. The molds used were also of a good quality so the inside of the parts are neat and clean. A lot of repro grips are rubber mold copies based off a real grip and cast in epoxy or some other material and usually done from a less sophisticated molding set up or even open faced molds. Modern injection molded grips in plastic, as noted above, will have different properties than bakelite or acetate used in the WW1 and WW2 years.
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