score:11
I don't believe there were any wanted posters in Spain in the 1500's. If you have evidence, please document your preliminary research in your question.
The first record I can find of a wanted poster in Europe was 1881; although the comments suggest that wanted posters were common in the US at that time. True West Magazine suggests (non-conclusive) that they date from the last half of the 19th century.
Wikipedia on Calico Jack cites an illustration in a 1722 book. If a wanted poster existed, I suspect they would have used that in preference to a woodcut.
According to the history of posters, "The first posters were created in the mid 19th century in France as advertis*m*nts for new products." Which suggests that posters and wanted posters both emerged well after the 1500's
Upvote:4
They looked like this:
In all seriousness, though, wanted notices were more a product of the 18th century (1700s) when printing became cheaper, although such notices also appeared in latter part of the 17th century. In the 1500s paper and printed matter was expensive and most people could not read.
There were definitely bounties offered, for example, it is rumored that Phillip put a bounty on Francis Drake's head, but it is hard to find documentation of such offers before 1650.