The Master Berry Bowl on the left is authentic. It measures 9" in diameter and 4" tall.
The bowl on the right is a reproduction made by Mosser. It measures 8" in diameter
and is 3 3/4" tall. Notice the larger amount of threads. It may have a letter M
pressed in the glass on the bottom of the bowl. The Master Berry shown along with Small Berry bowls and a covered Puff Box in this pattern have been massively
reproduced in many colors. One other way of telling the repros is the feet will be Opalescent.
On the older version the feet were never Opalescent.
Beware when buying