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I had it painted by a specialist painter here in the Netherlands. There's choice from a number of specialists around here for this kind of work. Not sure where you are located but I think it's best to find a painter locally to prevent the shipping hassle. Could be a body shop who are willing to take it on.
Olmo never was one of the big brands, producing smaller numbers, and seem to have done small batches of all kinds of higher end models.
Nice find! Definitely deserves a good restoration.
Here's a Leader (Air) I once restored from a shitty paintjob. Pearl white with decals made by Cyclomondo.
Had to sell because it turned out to be too small in the end :(