eBay is listing a Rudy Muck trombone. I’m familiar with Muck mouthpieces, but I’ve never seen one of his horns. The “Citation” model (which the listed horn is) was his most expensive horn. Is this horn worth having?

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Here’s some info on the horn, which sure looks like an Olds:

https://www.brasshistory.net/MuckTrombone.html

I have a similar Rudy Muck trombone. It plays really nicely, but it is a very small playing horn. This one looks really similar. I think it's a 7.25 bell and 485/500 bore. Mine had the slides replaced with olds ambassador parts. I think I have an ad selling it and it was definitely lower than this price point if you wanted to own a Muck.

The braces look kinda Olds-ish, but they're not quite the same shape. The end parts look like they've got flats ground or machined into them, while the equivalent Olds parts have a slightly rounded "crown". You can see a sharp transition from the flats to the rounded portion on the Mück braces; on Olds braces it's a smooth blend.

Olds was granted a US patent for their streamline Super brace in 1938. That patent expired in 1952, so there would have been no restriction on anyone wanting to produce a similar design.

There's some other Olds-ish styling cues (the slide lock, for example), but those, too, are just a bit different..