Hi - I own a small music school in San francisco. Today , someone came in trying to sell a DelVecchio Ukulele . I have found info on a resonator variety but this I think is a concert uke that looks at least 20 years old . It has a black and silver nameplate on the headstock that says Delvecchio and Industria Brasileira and a bunch of numbers that I don't think are model numbers but a phone number. Does anyone know anything about this or where I can find more info?