Stephan,
Your o-block pistol was made late in 1936, say November or so. There were only about 85,000 Model P.08s produced by Mauser in 1936, most of them going to the Army. The o-block was next to last block, followed only by the p-block which spilled into 1937.
Late production 1936 P.08s displayed the new S/42 toggle logo. Prior models in 1934 and 1935 displayed an S/42 with the S larger than the 42.
Also 1936 was first year that dates were used on the chamber. Prior Mauser used K and G for 1934 and 1935 respectively; but when Hitler abrogated the Treaty of Versailles in May 1935, all attempts to mislead the Allied Control Commission were abandoned and Germany openly started to rearm itself..
!936 was also the first year that blued bodies for magazines were introduced; around the m-block of production. As previously noted the magazine you show is from later production and is not period correct for the gun.
Otherwise, you have a nice unmolested example of Pre-war Mauser P.08 production.
Hope this helps
John
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