Here are some more Vacors patches which I think could be taken for old. Sometimes the cutlines are v-shaped and it's easy to guess that they're modern. But when the cutlines are straighter they start to look more like Akros and Vitros.
Interesting-looking variations exist but we don't often see them on the boards, so I don't know how common they are. That's one of the downfalls of vintage collecting - we collect VINTAGE. We don't know all that much about the modern ones. Always a surprise coming forward.
(Schmoozer posted. I think he found them on the web.)
Here's another set. I'm not sure if these are Vacor. However, they are foreign. Chris posted them.