I'm not going too far out on a limb by saying that Dolnet probably did not manufacture bass clarinets. Bb clarinets, definitely. Saxophones in various pitches, definitely. For G Whiz,
here's a JC bass clarinet that doesn't look very much like yours. I'm not quite sure why some specialty clarinet makers decided on just making soprano clarinets. I do know that it took hundreds of years to come up with a really good working bass clarinet design, but that design was well in place by the end of the 19th century.
Remember:
* Just because company A made stencils for company B, it doesn't mean that ALL company B horns were made by company A. As an easy example, Selmer New York saxophones were almost always made by Conn, except when they were made by Buescher.
* The above also means that just because you know of stencils named something were generally produced by a company, not all stencils with that name have to be from that company. As a fun example, stencils named "Vega" were built by probably every company on earth at some time.
