That's right Calvin. Dave Suponski's first post on page 1 of this thread explains it. Probably all Parker (and most other makers) "rubber" buttplates, whether "dog's head" or not, right up until sometime in the 1940's were gutta percha. There is a surprising difference in weight between a gutta percha buttplate and one made of plastic - the gutta percha one will be easily twice the weight.
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