Is this some kind of way of marking dies?

mumu

Ok the picture below is not great but I will try and get better ones if needed. I have about 8 of these coins in copper and silver. I am looking at them I spot 2 perfectly symmetrical round raised disc like raised metal lumps inside this particular device. My first thought was that it was some kind of contact /PMD mark. I look at my other silvers and none have it. I look at the copper versions and one of them has the same exact marking, only it has 1 instead of 2. So next I move to the internet to look at photos of other coins. Most do not have the marking but low and behold I find another silver with the 2 markings. Im pretty sure by the location and size that it is in fact the same marking though the picture might overall be inconclusive. But maybe someone will recognize what I am describing as some kind of standard way to keep track of dies on certain coinage? If its any help these coins are from Uruguay but minted in Santiago Chile mint. Someone on another forum suggested rusted dies. But these little "discs" seem designed and perfectly round.

mumu

BUMP Updated pics:

1960NYGiants

I think the artist/engraver accurately depicted the ancient Inca/Myan pictographs or stone carvings of the temple ruins.