Tony suggested I write a book on civil headgear of the KR and Weimar eras. Unfortunately, I do not have much in the way of civil headgear for those eras, and there are no references to id the various hats. So, the fastest and most economical way is to start a reference here using hats I stumble upon across the web.
Here is a DRK (Red Cross) Weimar visor with its original box and oilcloth hat cover. Apparently, they used red piping in the early days of the Weimar Republic:
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