What is a two headed half dollar worth?

It's not a US Mint coin, it's a magician's coin made by cutting two genuine half dollars through the center, swapping sides, and fusing them together.

It has no numismatic value but if at least one of the halves is dated 1969 or earlier it would have some value for the silver it contains. To know exactly how much, the specific dates of each half would be needed.