My Buddy Brought 4 Pirate Coins To My House

The pink felt tells me that these were adhered into a display of sorts. I know nothing about these "coins" but would suspicious of their authenticity. Conversation pieces nevertheless.

Unfortunately NONE of these coins are real, they are very poorly made replicas. And the weights are less than half what genuine pieces would weigh.

True.

I'd be more interested in seeing the entirety of the display card or board - it might show some indication of whoever manufactured these replicas. Here's what we can say about them, from what we've seen in the OP:
- Made for a "pirate-themed" souvenir-shop.
- Made in and for America, given the use of the phrase "our coinage system" with reference to the US dollar.
- Made before 1973, when the Hobby Protection Act was passed by the US government preventing the marketing and sale of replica coins within America that do not have the word "COPY" stamped clearly on them.
- Made by somebody who doesn't actually know much about the coins they are copying, because the second coin shown above is actually a copy of a gold Mexico 8 escudos, with the circle of chain around a curved-sided shield, not a silver 8 reales, which at the same time period looked like this Mexican 8 reales, with no chain circle but two pillars on either side of a straight-sided shield. The Spanish deliberately made those two coins with those different designs, so that people wouldn't try to gold-plate a silver piece to make it look like a gold one.