Scheurich & Greulich and Scheurich used an off white clay. Pieces from the late 70s and the 80s a can sometimes have a light brown clay.

Scheurich & Greulich and Scheurich used a three digits long form number followed by the size in cm. Some forms have the size in cm with one decimal ( ,5). Some pieces have only a form number.
 

Scheurich reused form numbers. Scheurich made often small changes in the form but continued to use the same form number. This was common during the late 50s to the early 70s and many forms can be found in three generations. Some form numbers was also reused for complete new designs.