However, the very detailed discussion at https://theowanne.com/knowledge/mouthpiece-museum/brilhart-mouthpieces/ does not show any metal mouthpieces before the Level-Air. It also says that "The first version made had heavy machine marks going from side to side on the table. The later vintage models, that otherwise looked the same, had length-wise machine marks on the table. The first version played better than the later version." Mine has side-to-side machining marks.
Wanne's discussion also does not mention when (if ever) Brilhart started making bari pieces.
So my best guess is that I have a piece from the early years after the Selmer buyout?
None of the original-type Level Airs were marked 'Level Air'. The serial number you list is a pre-Selmer number so you have an original one.
There certainly was another metal Brilhart during the '50s, called the 'Velvet Brass' that is very rarely seen. Boots Randolph played one for many years. Depending on condition, your mouthpiece could bring a couple hundred, and there are those who prefer the smaller sizes so it could certainly be sold.
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