csontos
I don't recall any Dual that fits your description.
Not an Oracle. Definitely Dual. I bought one of the 2 first Oracle tables in '78. The name tag read 'Alexandria', later to be renamed the DelphiYour memory is failing you. The Oracle Delphi preceded the Alexandria, which was introduced as a budget alternative to the Delphi. Details are here.
I don't recall any Dual that fits your description.