Alexandre is a stencil made by Orsi, an Italian manufacturer. Probably made in the the mid 60's. Decent quality, good sound, ergos are a little more comfortable for smaller hands - I owned one a few years ago.
I think they were stencilled for Alexandre Selmer, a brother of Henri Selmer.
More info on Italian saxes here: https://forum.saxontheweb.net/showthread.php?5226-Italian-saxes
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