AFAIK, they were made of hard rubber, or gutta percha. It is a natural product that was used prior to the invention of true plastics. When new it is fairly soft and flexible, but as it ages it becomes brittle. That is not a big problem with Webley revolvers because the grips are well supported, but in the Webley auto pistol grips which are hollowed out for the recoil spring and thus are very thin, breakage is common.
Jim
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