17th Century Silver Reales. Wow congratulations on a epic find. Welcome to the Reales Club.
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Wouldn't that be 18th Century?
Nice find!! Maybe I'll get my detector out today...
The date is definitely 1774, and it is a Spanish silver 1-Reale coin. The 2-Reale coin is as wide as a US quarter-dollar. Creskol, an 8-Reale coin is the size of a US silver dollar, because that US coin was based on the 8-Reale coin. Same reason the size of our US quarter and half-dollar are approximately the same size as a 2-Reale and 4-Reale coin.