for comparison here is my 'Kunstleder' artificial leather covered Vopo cap. The artificial leather was placed over top of a common Vopo green felt cap. So it is quite unlike Torsten's cap.
there are at least two types of 'Kunstleder' artificial leather covered caps and also a 'Stoffbezug' cloth cover version . Zollers book only shows two of the three types, on pages 132 & 133, images Abb. 105b (Torsten's cap) and Abb. 105c. (the 'Stoffbezug' cap).
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