10-12-2015 07:46 PM
The cap is original.
You need to read my article on the RN number system:
The Reichsbetriebsnummer RB numbering system.
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I've had read that article pretty thoroughly in the past and saved it, missed it somehow.
By late 1944 the Rb nummer started to be written as RF Nr with the same usual 9 digit code. This appears to be simply a change of name to Reich Fabrik Nummer. Once again, older collector’s speculation on this RF number was that these were only given to factories outside the Reich. This has proved to be false.