Hutschenreuther Marks
The vast majority (probably up to 80%) of all the Royal Vienna style plates were decorated on porcelain blanks made by
Hutschenreuther factory. The factory used two marks, a shield (most of the time) and a circle (rarely) with letters CMHR in it. All
Hutschenreuther plates have one of these marks impressed on the back together with a number representing the plate's diameter
in centimeters (usually 24, 24/5 or 25). The impression is often very faint, hard to find and even harder to photograph.   
Here are a couple of examples
The presence of this mark is very important. It guarantees that the plate is antique, made circa 1900. Because it was impressed
into the body of the plate before all the glazing and firing took place, this mark is absolutely impossible to fake.
Absence of this mark certainly does not mean the plate is fake. But the presence of the mark is a nice confirmation that it's real.
KPM Mark
About 80% of all the Royal Vienna style plates were decorated on porcelain blanks made by Hutschenreuther factory. Where did
the rest come from? About 10% were made by KPM which have very distinctive markings. The rest were done using unmarked
porcelain blanks made in France and England.
KPM plates are marked with a blue underglaze scepter right in the middle plus some impressed characters. Those characters are
very important since they're impossible to fake while the scepter can be fake. There is always an impressed letter surrounded by
several dots. It most likely represents the year or the month when the blank was made.
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