Initially you asked for comments on the takedown lever marking but as you and others have commented, there are potentially other issues.
I am sure that I and others would comment further if more photographs were available. There are several ways to distinquish between a DWM frame, used intially and a DWM frame final machined by Mauser and a Mauser made frame (with and without hump).
From the photgraphs provided, the toggle and toggle marking type faces are typical of late K- dates and all G-dates. The K-date on the chamber is typical of the 1934 production.
But, as always, the devil is in the details and more and better photographs will help.
For example my SN 9214 K-date has the hump and jig marks. Better pictures might disclose other anomalies.
So, as I said before; the S inspection mark on the takedown might be the least of your concerns about this particular specimen.
John
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