A Google search on Jno. Hy. Andrews Toledo Steel flagged up a Holts sale entry for another high quality Belgian made H. Mahillon SLE using these tubes, as well as a Hallowells listing for a similar gun by Forgeron .
Interesting that at a time when British and American gunmakers were routinely importing German and Belgian made tubes at least one British steel maker was supplying tubes to Belgian gun makers.
I believe that Whitworth barrels are also found occasionally on high quality European shotguns.
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