It's certainly pretty! Have you tried to play it in anything?
Dave
2020ish? Shires Q30GR with 2CL
1982 King 607F with 13CL
Yamaha 421G Bass with Christian Lindberg 2CL / Bach 1 1/2G
Bach Soloist with 13CL
1967 Olds Ambassador with 10CL
1957 Besson 10-10
Jean Baptiste EUPCOMS with Stork 4
I don't know a manufacturer, but if you search for "double cup" or "doble taza" mouthpieces on Ebay, you'll see quite a few. Maybe that will help you further.