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From: John
Remote Name: 65.45.150.19
The answer to your question is complicated, but I will give it a shot.Capacity marks began to be generally used around 1860. Prior to that the marks are very rarely seen. You must understand that Germany only became unified in 1871. Prior to that what became Germany was made up of many different kingdoms, and minor principalities under the control of Prussia, Bavaria, Austria and France. Each of these areas had differing standards of weights and measures and even mointary systems. What is now Hoehr-Grenzhausen was controled by Austria and had a completely different set of standards than other adjacent areas. Even after the formation of the German Empire in 1871 most local standards remained in place until perhaps the late 1880s. So you will find many differing capacity marks.
Placing capacity marks on the front or the side or the back differed from factory to factory and again it was probably the late 1880s before it was standardized.
10/20 is the same as 5/10, 1/2 or 0.5 and probably conformed to the local standard.