Absolutely everything coming out of Simson had been inspected and had acceptance marks.
The lack of E/6 or E/33 acceptance is more indicative that it's probably a replacement plate.
I don't know if there were variations to the milling profile of the part that were also good indicators of originality.
Here's my Simson's side plate:
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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