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I bought said horn with a recording bell. I want an upright bell for it. I sent an email to Wessex on their website but never heard back. I sent that based on information from this forum that their upright bell for their 6/4 horn would fit the Mammoth. Anyhow, I'd buy an upright bell new or used in good condition. Maybe Wessex has a contact site I don't know about besides the "contact us" box on the website. Anyone know?

I believe @Lee Stofer has one in stock. I think it was made from a Kanstul bell, but I'm not totally sure about that part.

A Holton 345 bell (with some trimming off the small end) will net you a one piece, fixed upright bell that is very, very similar in profile to the original Martin fixed upright bells.

In which case, one of the bells that @Bloke has imported might also be a good match, either for a one piece upright, or with another male tenon could make a detachable upright bell.

You might try Wessex again, I was able to get one from them. I recall Paul Scott said he had one made from a Miraphone (I think) kaiser bell, but I'm not sure which model.

I have a nearly-new-condition Kanstul reproduction bell for a Martin Mammoth, lacquered. Please contact me for more details.