If we are talking about the pre-war period, let's say about 1910, then according to the available information, there was company Emile Warnant et Cie and there was company Ernest Wilmart et Cie. In the gun trade was the first company, the second traded in marble. In Liege were no other companies whose stamp could be EW Co, of course, if we believe Druart and Gadisseur. Therefore, a guarantee close to 100% could be given if the production date of the shotgun was known (the proofing date in Germany isn`t like that).