Silver Presidential Dollars?

A coin store in my city is offering an "off metal" Presidential dollar like this for $400, but I can't see what kind of blank would cause an actual error like that (leftover SBA planchets in the mix?).

Still, more fun to find than a regular dollar coin

Bet this is a QVC special....they love to offer exclusives like that.

Looks like a silver plated or platinum plated Home Shopping Network coin.

I am not sure about the plating process for the gold dollars and if a white color is even possible like on a Zincoln cent.

I would check the edge of the coin. See if the edge is one solid color or if it is clad like an SBA. If it is solid color it is almost certainly aftermarket plated. I do know that some Washington dollars struck on SBA planchets exist. This John Adams being the second coin has a slight chance of being struck on an SBA planchet, especially if they were striking some early in the year for things like mint sets or roll sets.

Something like a silver plated coin could have been made aftermarket to supply the silver President dollars that are listed in the 2000 RedBook.