At the very least it is worth $7.70-ish based on the 90% silver content contained in it. However, it depends on the mintmark and condition to tell you how much collector value it has. The better the condition the higher the value, as with all coins cleaning decreases the value for collectors, but even in the worst-case-scenario of a very ugly, slick coin it will still be worth nearly $7.70 just based on silver. But if perfect it can be worth upwards of $100.
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If you are talking about " Australian" round 50 cent pieces then I think they are worth about $5 each
50 pennies or fifty cents are in a fifty cent piece or a half dollar.
a dime, a quarter and a fifty-cent piece.
It means that it was struck with a filled die and may be worth a few bucks, take it to a coin dealer.
fifty-cent piece and two quarters.