Hi and welcome to posting on the site!
You need to photograph both grips, especially the back side in order to determine if they are originals or a repro set. If original, they are worth $200+ depending on condition and how badly someone wants them. There is the "hot pin" test, which can be performed in a discreet place and will tell you if they are bakelite, (some smoke and a funny smell) or plastic, (bubbling, melting and a clear burnt plastic smell)
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