Very interesting to see at least one monkey coming down from the trees.
I don’t know American law, but at least in my country the guaranty obligations are with the retailer, who may then refer his claims to the importer.
Miraphone instruments sold in Southern Germany have ben seen to be engraved as prominently with the retailer’s name as well as with Miraphone’s. I don’t think it is demanded by law, only such engraving hints retailer and maker back their merchandise.
When the narrow bore piston French horns went out of fashion in England 50 or 60 years ago, B&H/Besson had no tradition of making rotary valves (even the early Sovereign trombone valves came out of Markneukirchen). Still B&H/Besson wanted being present in the market segment for horns. They had two foreign makers producing for them, Lidl and B&S (B&S out of their Hoyer workshop). It was not always clear which maker, but at least this engraving told the country of origin, and I have seen such engraving on a British military owned instrument:
Bell engraving.jpg
Schneider was the name B&S put on instruments which approached a grey area. This horn is a copy of an Alexander 103.
The American designer Fred Marzan worked together with Böhm & Meinl and with Willson. This engraving leaves no doubts about the actual maker:
Engraving.jpg
The Salvation Army made instruments considered very British, but apparently the business was not without problems as production stopped some 40 years ago. And this engraving tells even they distributed foreign instruments:
Engraving.jpg
If an importer keeps the engraving of the maker on the bell and adds Imported by [Name of his business], doubt would find much less reason.
Klaus