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Were these copies made from roughly the same time period?
No. Being brass and rather thick, they never would have fooled anyone back in 1500. I don't know who, when or why they were made, but given the number of them that crop up here on the forum, I suspect they're a modern fabrication - sometime in the last 50 years. Similar kinds of replicas have been used as promotional gimmicks in the past by companies like Reader's Digest, but that's only one possible explanation.
I've also finally managed to read enough of the inscriptions on the second coin to identify it. Sadly, it also appears to be a replica, since the original coins are supposed to be high-quality silver, and this coin doesn't look silver in your pics. The design is taken not from a Spanish coin (sorry about that), but a Crusader coin: a silver gros or half-gros of Bohemund VII (1275-1287 AD) of the County of Tripoli. The sixth coin down on
this page is an example. The design seems to be popular with replica-makers;
these guys sell sets of five replica Crusader coins, with a Tripolitan gros the fifth coin in the set.
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