Ah, excellent! My plate is almost certainly a later version than that (or has been given an all-over repaint post-WW2). It's also missing all of the bolts, but now I know what they look like I can make some up to suit. The missing bolt on your plate may be deliberate - the one under the front of the variometer is difficult to access so may have been omitted (or they assembled the variometer to the plate and found they could not then fit the bolt).
The circular stamp is almost certainly an inspection mark.
Thanks for posting the photographs, very useful.
Chris.
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