Here's one of those weird vintage variations that you just sometimes stumble upon by happenstance. I was unaware that the Roy Campanella 1950 R423 had back color variations, but it does. When the below hit eBay, I would have been interested even if it was the Orange I already owned. However, it was even more intriguing as it was a new color I could add to my Campy Collection.
The Orange Back (which I erroneously called Red the first time around....thanks, color blindness!) is joined by this beautiful Purple Back.