Ever find one of these?

[tuckerD]

found a double headed 1964 Kennedy half dollar. Been at this for about 2 years and never seen one. How bout you guys? Definitely not silver, has no ring to it. But same diameter and width. feels close in weight too. A novelty more than anything.
TD

 

[festiva_ford]

More than likely a novelty, rare in circulation though.

 

[FiresEye]

It's used in magic tricks, thievery, trickery, and as a novelty. THe metal composition is most likely different, unless someone spliced a half thinways and somehow joined the two halves to create a real two header with very little display of the coin cutting.
They should be worth at least $5, to collectors of such novelties.