Probably just stating the obvious but for what it's worth:
We know the date letters that were in use between 1925 and 1935, resulting amongst others in the K-date and the G-date on Mauser produced lugers of 1934 and 1935. The encoded date letter was the result of a German army directive and it was halted as of 1936. Interesting to know is that the proposed year letter for 1936 was the 'S'.
Another 'S' code, which probably was the basis for the Simson-link, was that Simson (or BSW, Berlin-Suhler Werke as the company was know at that date), was assigned to Simson/BSW in the same time frame and it was used for their K98 production.
Probably just recycling old info here, but it might be useful.
Another thing worth investigating is the following:
Can owners of Circle-S marked guns check if the chamber is still the stepped chamber design?
If not, the 'S' might be an indicator for 'Stahlhulse', indicating that the gun is modified for the use of steel cased 9x19 ammunition. Just a wild fantasy, this, but worth checking nonetheless.
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