in 1969 there were no silver dollars ...just nickel dollars...they are only worth face value.
Even in pristine condition (no folds, no discoloration), it is worth $20
I'm assuming you mean a Canadian half dollar, if so then not a whole lot, silver was removed in Canadian coinage before 1969 and as such it is pretty much just worth face value which is 50 cents Canadian.
The 1969 Canadian 20 Dollar note in mint uncirculated condition is worth about $75 US Dollars. A very good quality one would be worth $20 USD and anything worse would be worth exactly $20 Canadian dollars in a Canadian store...
Despite being replaced with the "Loonie" some years later, this coin is worth face value only.
No copper its copper nickel
Unless they are crisp and uncirculated, all $20 bills dated 1963 and later are worth face value only.