freaking insane

I try to replace as little as possible on mine but if a decal is totally hosed and looks like hell it's getting replaced. I go for “period correct” not absolute 100% originality. One thing I have learned since I got interested in vintage bikes is they are NOT like vintage cars - they don't have VIN numbers that you can trace and weren't (for the most part) made on assembly lines so the spec may vary. The builders back then seemed to use whatever was available and particularly during the bike boom supply was unreliable at best.
My 1972 Bottecchia Giro d'Italia is a good example - most people will tell you that the "official" spec was a Nervar crank, Campy Record (not Nuovo Record) derailleurs, and Fiamme red label tubular rims among other things. Some, like mine, came with Valentino derailleurs cuz they probably ran out of Records and a Stronglight crank. I replaced the worn out Valentinos with Record front/Nuovo Record rear and I'm not sweating the Stronglight since that’s what it came with. Somebody had replaced the original red labels with steel clinchers so I picked up some NOS red labels off eBay. They look great and I'm not gonna worry if they are actually 1972 model rims. I don't know anybody who could tell the difference anyway. I sure can't. And I don't feel I'm misrepresenting anything. It's a well maintained 1972 bicycle with such repairs/modifications as would have been appropriate for the period. Now I suppose if you were selling it or entering it in a show that might be another story.