The last photo shows is the KPM mark. The item was brought to US from Russia, where the actual mark on the plate had to be covered during Stalins rule because it was German. You can still see the KPM mark on the plate and it is in excellent condition.
The item "KPM Porcelain Plate, Rare Königliche Porzellan Manufaktur Berlin Porcelain Plate" is in sale since Tuesday, October 30, 2018. This item is in the category "Pottery & Glass\Pottery & China\China & Dinnerware\KPM". The seller is "zhannizarov-0" and is located in Brooklyn, New York. This item can be shipped worldwide.