Aaron,
I agree with Pete's identification.
The reason you didn't find your marking in the identification sheets is that it is not properly a "proof" mark. There are, broadly, two kinds of marks to be found on Lugers, Inspectors' stamps and Power Proof stamps. Lugers were inspected constantly during their manufacture, and Army regulations required most of the pistol's parts--some 30 of them--to be stamped with a prescribed figure to denote their approval for use. The Erfurt and Simson manufacturing plants followed these regulations to the letter, stamping with a Crown over a Fraktur letter (Erfrut) or an Eagle over 6 (Simson); DWM and Mauser pretty much ignored them.
After a Luger's completion it underwent power-proofing, firing of two overpressure rounds to ensure the gun's safety. Upon passing, it was stamped with Power Proof stamps on the right receiver, barrel, and left breechblock. These are the only markings which can properly be referred to a "proofs", although in discussion we all blur the distinction all the time.
The identificatin sheets in the information section of the Forum shows primarily Power Proofs (either alone or in combination with Inspector's Marks where found on the receiver) and Foreign Contract proof or acceptance marks, as well as some other miscellaneous marks. They do not include Inspectors' marks by themselves, which is why you did not find the Eagle6 Simson Inspector's Mark as stamped on your takedown lever.(This omission should probably be rectified at some time.)
--Dwight
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