I'd agree with your assessment of it being an Italia and most likely original paint.

Cool Columbus decals on the fork - wondering if they could pin point the date?

They must have made their decals a lot tougher back then, Pinarellos are famous for their decals flaking off. Or is there a clear coat?

Love the palmares decal - most likely original so that sets the earliest date.

Wasn't aware they did gold headtube decals - very cool.