For those interested in the RAD in particular this is superb period information regarding the pricing of uniform insignia.
Early (1936) letters and quotes in answer to Oberstfeldmeister Brecht RAD Gruppe 82 requests for uniform and uniform insignia.
The letter with the red Tailor stamp to the top left is a two sided detailed break down of costings to include Reichsarbeitsfuhrer insignia.
Example, party armbands are quoted at 90 pfennigs per item.
An invaluable piece of ephemera relating to period uniform costings.