Re: Elkhart Sax
Buescher made a second tier (intermediate) line of horns know as The Elkhart, and it is very possible that this is what you have.
To quote Pete Hales:
" The Buescher Elkhart is sort-of a stencil: an Elkhart-labeled horn is an older True Tone model, made with the same old tooling, but made in the 1930's (or so). The Elkhart, however, is engraved as such and was available in lacquer."
Without seeing the horn, I would not wish to be held to that, however. Elkhart was the center of American musical instrument making by the 1920's, and there were many stencils and other lines of horns by various makers that used Elkhart in their name.
I am also sceptical about the year of manufacture based on the serial number you provided. Buescher was one of the few makers whose stencil and second tier line of horns matched the serial number sequence of their first tier lines. Given this, your serial number would indicate a horn made around 1910. This is awfully early, and I think your horn would more likely date around the late 1920s through the 1930s, or so. If you could provide a few pictures, this would be very easy to clear up.