Between 19 the trademark design was changed slightly each year.
They still incorporated the bumblebee, albeit in a smaller size. From 1960 to 1972 the trademarks changed to a different bumble bee design.
Subsequently, production turned from utilitarian pottery to more individual artistic creations.
This mark is sometimes referred to as the Missing Bee Mark - TMK-6.
In 1990 the mark was revised to reflect the reunification of Germany. It once again incorporated the famous crown and is TMK-7.
Originally the suppliers catered for the local market with culinary and garden wares and some exports.
Following the arrival of the railways in 1873, production and distribution opened up and the region soon had around 50 producers.
This marking is sometimes called the Three Line Mark and is TMK-4.