I've encountered some Revelle saxes. One was a Evette Schaeffer stencil, the other was a mystery. Both were student horns .
It doesn't mean that your trumpet is on the same level. Yours could be higher in quality. Most likely Revelle was a line of instruments purchased from other makers (Stencils). This means that a number of different companies could have made their instruments. At least yours is marked Italy. I would go to
Horn-u-copia public forum discussing antique, obscure and out-of-production Brass Instruments and look at pics of the Italian trumpets that they have, and see if yours resembles any of them.
Good luck !