13 x 135

Does somebody knows the history of the 13 x 135 ctge ?

The German one from the 1930’s which existed in 15 and 20mm? I doubt.

Why do you say 15 and 20 mm??
You mean perhaps 15 and 20 mm necked down to 13 mm ?


Hard to say what has been first but I mean the 13mm, 15mm and 20mm which all had the same basic case.