Hi Curio,
The first mark obviously stands for Waffenfabrik Bern. The mark on the bakelite grips, S&Co, is the mark of Suhner & Co. AG, Herisau, a firm in business since 1864. You can also find bakelite grips marked MA, in this case made by Gummi Maag AG, Duebendorf.
Hope this can help
Fausto
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