Very interesting hallmarks on a pair of silver buttons. They have an import mark.
Other information: Chester 1902. The maker is Berthold Muller, a silversmith and importer of German silverware.
Hi,
``BM`` is sponsor`s mark (importer), not maker`s mark.
Berthold Mueller was an import firm, who distributed a lot of Neresheimer (Hanau) silver.
Regards