If you will notice on the article by Siegmar, I was the contributor of the photos and information. The photo of the underplate and coupe, in addition to the marking, was from the one I had. The grouping of 8 is where I got my information. Siegmar was surprised too, when I gave him the information.
Oh, by the way, In my travels 6 months ago, I spotted the underplate....in BLUE!
AKA: Mr. Vaseline Glass