[b][/b]I have Echt Bavarian Lindner Kueps Dark Blue Cobalt set of the following, (On back of one of the plates it says, Linder Kueps Bavaria Echt Cobalt 170 15 77/4.)

Dinner Dishes; Salad plates
Coffee Saucers; Coffee Cups
Sugar holders; Creamor
Pitcher; Ash Tray
Serving Plates; large salad bowl

Does anyone know how to get something like this authenticated so I can sell them? My mom brought them over with her from Germany in the 1950’s. They are in mint condition. Would be ideal for a collector.