I swear that I have a vintage Clauss that is plated on the tang and could have been up the spine.
Yes, I've had plated razors before. When they corrode, they have star like splotches and the plating can be picked off the star in some extreme cases. A while back, I was helping with honing some older examples and I ran into a couple of them. I might even have a picture or two - but not on this computer. In general, I would stay away from them for refurbishing though they are OK shavers if you can accept the blemishes.