Hi squirtdad, I do not see too many hands-on answers. Maybe mine will help, though it requires some work. A few years ago I met with a re-painted vintage Legnano, which was very convincing. I found it on the link below: https://recikli.com/tag/legnano/.
At that time, I only saw it as a frame. The original paint left on the steerer tube,
so I could compare it with the new painting.
The difference was minimal. If I remember correctly the original was lighter, but really breathtaking.
The hungarian guy who painted is on the this two links: Untitled Document and https://hu-hu.facebook.com/NB-Paintw...4380943926439/.
Try to contact him on Facebook and maybe he'll give you the code of the
mythical olive.