If the fluting was a machining step (which it appears to be) it is certainly possible that the parts were reworked to add the fluting slots. That could explain the E/6 marking on a part that was originally shipped unfluted.
After Simson's takeover and relocation of the manufacturing tooling, modifications could have been performed on the old premises or elsewhere.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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