Tootsall

I think you'll find that there are two parts to the question: does any particular maker produce finished instruments with their own name ONLY on the horn? and does any particular maker produce instruments using ONLY their own, in-house components?

Kanstul certainly concentrate on building everything "in-house" but they also build parts and horns for (many!) others to use. Schilke are, I think, the most "dedicated" of the "non-custom" companies, building "almost" all of their own bits (I am pretty certain that they source the beryllium (and possibly sterling?) bells from outside vendors) and only building with their own name on the instruments.

Remember too that Allied are certainly capable (and probably do) crank out "bits and pieces" that they'll sell to anyone who wants to buy; (water keys, bells, etc.) Even Yamaha (who ship with only "Yamaha" stamped on them) are now getting some production from factories in China (as are Bach/UMI).

All of the custom makers (including, until recently, Monette) use components sourced from others. Of course, Monette only builds with their own name on the finished product. It just doesn't pay most of the custom makers to set up their own valve production since a certain (and probably quite high) volume OR final selling price is required to support such expensive machinery.

It is definitely interesting though and the customers are reaping the benefits of this "cross-pollination" of ideas and components. Unfortunately customers can also suffer if they choose to purchase from a retailer (on-line and mail-order please note) who doesn't give them GOOD after-sales service and elect to refer problems "back to the manufacturer"!

Even the highest quality components can be poorly put together to make a junk instrument; the real skill is to be found in the people who put all the bits together so that the horn "sings".