Tom,
That's my thought.
Back in 1974 I had an artillery model. It must have had a rough chamber resulting in hard extraction. I shot it one day not long after buying it, and when I got home to clean it, I noticed one of the "ears" on the extractor was cracked part way through; the crack originating in the front corner. I could also see where the ear of the extractor had peened the rear of the mortise where it had pressed hard against it. So if there has been enough force exerted on a Luger extractor to break it I expect to see some peening on the rear surfaces of the mortise, and if the extractor is a replacement it's not going to bear the exact same grind lines as the top of the toggle bolt.
But all bets are off if the Luger is rare enough to have exceptional value and thus prompt a fake.
Thanks to the above, and other observations will be appreciated.
Curl
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