I found the attached tracing at the numismatics.org digital library in an article titled Coinage of the First Mint of the Americas at Mexico City, 1536-1572. This picture was about halfway down the page. On your coin you can see one of the bars (Pillars of Hercules?) pointing towards the A of ANN. On your coin I can make out the S on one side of the pillars and it appears the P is on the other side of where the second pillar would be. The flipside has the large V shape. Many other coins on this page have the LVS you have on the flipside. I cannot make out the exact placement of the LVS on the attached sketch.
Unfortunately, this website did not give the exact year or denomination for this style of coin. In fact, it appears this pattern may have been used on multiple denominations with the reverse motto changing depending on the denomination (see attached). But hopefully this will give you a good starting point. Out of curiosity, what is the type of metal, and what kind of detector was being used?
If this is indeed a 1500s coin, that would be fantastic! Please keep us updated when you pin down the exact identification.