It is sobering that in this high-tech world where even your washing machine is computerized, an unknown event for one person can take down an entire community that evolved over a lengthy period of time.

Well, according to my trusty micrometer, it mics out at 0.419" at the receiver and 0.363" at the tip, which doesn't match any of the dimensions Dale kindly provided. It's probably something made for some antiquated brand of mellophone that doesn't exist any more.

Dale has the right info. The answer is: alto horn based on 2.75" LOA and 0.432" shank diameter at the receiver. Now, how in the world an alto horn mouthpiece got duct taped onto a trumpet is lost to history.

@robertwerntz LOL. I would need to do some soldering before it could even be a stable lamp. And the in-laws would be shocked at the disrespect for their beloved ancestor.

The mystery deepens.....

The shank is definitely smaller than either a trumpet or my Kanstul flugel or my Yamaha flugel. It fits on my cornets, but is actually slightly large for the cornets. Also, the cup measures about 13.5mm in diameter whereas my Bach 3C cornet mouthpiece measures about 11mm. (My Yamaha 13F4 flugel mouthpiece is also right at 11mm in diameter, very similar to a cornet mouthpiece diameter.) SO.... the rim is larger than a normal cornet mouthpiece and the cup is much deeper than a trumpet or cornet mouthpiece; however, the shank is slightly larger than normal for a cornet but smaller than a Yamaha flugel mouthpiece. However, it is definitely stamped "Bach 7."

Could this be for something like a mellophone or mellophonium or alto horn or something? Photos attached.

Thanks, guys. When I first saw it I also assumed it might be a cornet mouthpiece duct taped to a trumpet receiver. However, when I got it off, I could see that it is MUCH deeper than a cornet mouthpiece. The shank actually fits on my cornets fairly well, but it is clearly not a cornet mouthpiece. I would have expected it to be marked 7FL, or something of that nature. But it isn't. Just plain "7." I'll post some photos tomorrow.

Not long ago, my sister-in-law gave me an old "family heirloom" trumpet that had belonged to a beloved ancestor. The last thing I need is another old trumpet but, not to offend, I gratefully accepted it. I told her that in the trumpet world we have a name for horns like this which is: "lamp." This old "American Leader" was obviously ready for lamp duty about 40 years ago. However, when I looked at the mouthpiece--held on by duct tape, of course--I realized it wasn't really a trumpet mouthpiece, at all. It looks like a flugelhorn mouthpiece, but the shank is too small to fit either my Kanstul or Yamaha flugel. It is marked "Vincent Bach Corp. 7."

I think I have read there are 3 different flugel shanks, and this might be the small one. Are there flugel brands that take smaller shank than Yamaha or Kanstul?

So, where is the USC marching band when we really need them? That Super Bowl halftime show was unwatchable.

@USAFBugler Thanks, USAFBugler. Yes, I use the Yamaha Neo Eb cornet now for almost all Eb parts. I can keep it in tune well enough, but I'm using it for 19th century USA charts almost exclusively.

So, here's an update..... WWBW listed new Hetman #2 as "in stock." So, I ordered 5 bottles. They arrived promptly, but the zip-closure bag inside the box arrived full of oil. The bottles all leaked like crazy.

I was at local shop "Hornucopia" about other matters, and I asked owner Sandy about Hetman. She told me that other players had told her the same thing. The new round-shaped Hetman bottles leak like crazy. Other players also report the product seems different from the old Hetman oils.

I called WWBW and they gave me a refund "no questions asked." They didn't want the product returned. I can see why.

@barliman2001 You could try one of these.....