OK, you finish doing a routine, seated, with six Morgan Dollars. You can, with little work, vanish them completely, ala Slydini.
However, if you work stand up, I give two routines, one based on a vanish of Roy Benson's where you balance the stack of coins on your raised knee, and poof, they are gone. You can leave them gone, or reproduce them from behind the other knee (ala Squash type routine).
One gag the boys like is I balance the stack of coins on my raised elbow and as I try to catch them they vanish.
It is made of case-hardened stainless steel and can't fail you.