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From a similar mark on the the Internet:

"An old copy of Diebener's Deutscher Goldschmiede-Kalender for 1925 lists this crossed hammer mark as that of C. Well of Berlin, manufacturer of flatware & small table silver, they were probably successors to Gebr. Petersfedlt of Berlin, who registered the mark in 1894 (but had been using it from 1882) "