1987 Libertad KM530 question (gold 1/20)

Anyone know anything about this piece? For better or worse, I just picked up the highest graded PCGS example. How rare are the 88's or the 1/15th ouncers?
0
Comments
I heard these were all made for one company (possibly Colonial Coins in Houston???) for jewelry or something like that.
I've got 2 or 3 of the 1987 gold 1/15 oz. in UNC. Bought them on ebay back in the late 1990s for just over melt.