I recently acquired a large collection of the blue charm #6978. Does anyone know best value options to sell this?

I am not sure what you mean by "large collection." The number of pieces in the set will make a difference as to the possible price.

If you do a search on Google for Noritaki Blue Charm or Noritake Blue Charm (the spelling can be somewhat different by people), you will find a variety of results with prices attached to them. I would also click on the option at the top of the page on Google for an image search of the same thing.