"Vintage" is the overused Ebay header hooker to try and get more people to look at listings and to convey some suggestion of age which is frequently false. I am not a Clark collector, but know enough to generalize that most of the 12" rounds are reproduction or fantasy signs. All one needs to do in the case of your first link is look at the sellers other items, which are all junk $20 repro/fantasy signs with a little rust and a couple chips added to try and fool buyers. I can't get the second link to go anywhere myself. But yes, they are being made now.....
Darin