22k Gold Royal Bavarian Plate / Charger

I purchased 23 of these Royal Bavarian 22k Gold Plates at an auction at the end of last summer.  I really haven't been able to find an appropriate value for them.  They have the Royal Bavarian emblem on the back (see pic) and a stamp saying warranted 22 Carat Gold.  The outside of the face of the plate has roughly a 2 inch band of 22k gold plating.  The plates are in good condition with only minor abrasions to the gold in the area closest to the eating surface and wear on the back ring where the plate sits on a table.  Any info on the value of these or time frame they were made would be appreciated as I would like to sell them in the near future.  Thank you, Jim.