Thanks for the information.Marcel, The Hat was made by Tonak but possibly for a English source. Tonak made hats for many different sources. The largest in the same time period was FWS Köln with the Stenton mark. Today FWS Köln are Stetson Europe.
Here is an early Tonak "Austrian" Zephyr Seal Velour made for Dunn & Co Paper Label. Similar format as your later Paper Label but yours doesn't mention Tonak (that is fairly common for later sourced Hats). Your Hat has a CM size and not an English Size. Where was the seller located?
The seller was located in Italy.