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It's on Facebook marketplace. Is this a Conn/Buescher partnership? Have you all seen any others?

doubt any partnership or collaboration

@lost has a few Bueschers on his website that he identifies as Conn stencils.

Buescher very-close-to-the-same-bore-as-Conn instruments (from that era - the mid-late 1920's and into the 1930's) don't parts-interchange with Conn (not valves, not caps, not slide tubing).

I have seen a connection between some old Blessing and Conn things, because Emil Blessing's primary business (early on) was making valvesets, and (surely) he made quite a few for Conn.

ex: I had an old 4-valve 5/8" (small) bore "Blessing" E-flat sousaphone that "screamed" Conn, and even pulled (structural) parts off of it to replace parts on a (larger bore) E-flat Conn sousaphone...parts which fit "like a glove".

Is it possible that this is a Conn instrument with a Buescher engraved bell?

Anything is possible. I would wager that the pistons and slide tubes are Buescher, and the brace flanges are also Buescher.
Could Buescher have purchased the bell and body bows from Conn?
Again, anything is possible.
That having been said, I’ve seen some jumbo Buescher sousaphones (an instrument genre less common than jumbo tubas) that do not resemble Conn at all.
I also see people striving to make a connection between York and Holton, but their parts really aren’t interchangeable either, even though there were some remarkably similar offerings from those two companies.
Just before the Elkhorn plant was shuttered, Holton attempted to step up their trumpet sales by making a complete copy of a Bach Stradivarius (I’m thinking they called it model 101). Even though it looked to be exactly the same, Holton made all of it.
All of this having been said, it made complete sense for Selmer, USA to have purchased Buescher, because the Buescher line was way more similar to Conn, and Selmer had something to gain from purchasing Buescher, whereas Conn would’ve had little to gain (at least, in my own historical perspective).

Can someone please post a link to this one? I can’t seem to find it on Facebook Marketplace. Thanks.

Somewhat similar Buescher "640", from horn-u-copia.net

Bnloewen wrote: ↑Sat Dec 18, 2021 1:41 pm Can someone please post a link to this one? I can’t seem to find it on Facebook Marketplace. Thanks.

https://www.facebook.com/marketplace/it ... tory_share

I have a 4/4 (4-piston/top-action) Buescher recording bass - with the standard 19" bell...not the optional larger bell.

It features the same LACK of a separate bottom bow as the one pictured.
Via that PARTICULAR feature, I've always assumed that the Buescher tubas (made that way) were made from the same tapered tubes as (either) their 4/4 sousaphones or their jumbo sousaphones...

...ie. the "first branch" of the "sister" sousaphone becomes that (unusual appearing) part on the "sister" tuba.

bloke wrote: ↑Fri Dec 17, 2021 4:54 pm doubt any partnership or collaboration

Bloke, you're more wrong than you like to admit. This is obviously an old style conn 3xj. Buescher most definitely did work with conn to manufacturer stencil instruments. I have more than just tubas in my collection. A buescher bass saxophone is the same model conn bass saxophone.

OK...but I've worked on both Buescher and Conn bass saxes (admittedly, only two Bueschers and only one Conn) and they weren't the same.

I also picked up a Buescher jumbo sousaphone once for cheap, and sold it for only a little bit more because the valves were leaking… It was nothing like a Conn jumbo. It would seem to me that – of all tubas – if they were going to share the same model on something, it would be a 7/4 something.

To avoid further rhetoric, how about "you're correct, on all counts" ?