Sorry, the previous posted was uploaded accidentally before I had finished...
You see, the letters are the same as in Arnold's posting. This base also is of a rather lightweight material and it clearly shows Wilhelm Bischoff genes.
I also found this here:
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So, a number two - but of what??
At the moment, I am preparing the whole EPD "D1" for a test run and I am going to present it and the video (hopefully) in a different thread.
Regards
Thomas