What country has a gun proof a small crown with a capital M below it and possible years for a W. Richards double barrel shotgun?

The W. Richards shotguns were mainly made in Belgium. They were an attempt by Sears Roebuck Company to cash in on the well known English gunmaker Westley Richards, but have no connection to the Westley Richards Company. There were listed in the Sears catalogs from the late 1890s and early 1900s.