Um, the essence of pipe tobacco. It looks to have a straight-hand stock and long triggerbow which usually denotes a British influence. I've seen French and German straight-hand examples with sling swivels, which regarding scatterguns are an indicator of some other market other than the Britian and the U.S. of A. I'd looks toward a country that either acknowledged/accepted Belgium's proofmark system or didn't have proofmark laws during the 1898-1924 period. Although there was a pre-WWI attempt for every country with proof laws to get on the same page at the International Proof Conference of 1914, I don't think it was until 1927 until one sees true reciprocity. Does it have a buttplate or is the wood chequered or hatched?
Kind Regards,
Raimey
rse