Fifty cent piece - nothing special about this coin. It isn't all that rare. It isn't all that expensive. When this coin was minted, Andrew Jackson was the president. Abraham Lincoln and Edgar Allen Poe were both 21 years old. As I recall, $800 per year was an ordinary income during Poe's life. He never earned more than $800. If a person worked 260 days to earn that money, then one day's labor would gain 6 of these. There were those who worked hard and earned less.
This coin was probably passed from pocket to purse until well after the American Civil War some 30 years after its minting. I don't know when coins like this one became collectable.