The marque goes back to immediate post WWII. The founder, Viviano Nerozzi, was an anti-fascist and anti-Nazi partisan.

Your lugged frame with Strada-clone crank, 5sp, curved Record-clone QR dates to mid-late-70s.
You have a beauty there, and a great project.
Small Viner write-up at CR with a '79 example: VINER bicycles main page

I have a '92 CX, and by then all Viner were fillet-brazed and unicrown fork.
Viner is still making very fine bikes today.