Are there any recording bell F tubas?

[Wyvern]

Quite a few British F tubas had recording bells. Was part of the standard equipment for orchestra recording before the days of electronic microphones.

If I could have kept and played that Boosey F I had, I was going to try and get a recording bell for it. The last British F played professionally was Stuart Roebuck of the Halle Orchestra in the 1980's.