Mauser had a habit of reusing available military contract odds and ends to build pistols for commercial orders during the war. So it is not surprising to see all sorts of variations in parts and configurations. There are too many, good quality, banner anomalies around to support this. The pistol was most likely built or rebuilt after 1942. The chamber date can be misleading as it only served a purpose on military contract P08s as well as on some other contracts. But they would have not discarded perfectly good dated receivers after the year with which they were marked ended.
Any chance to see some photos of the pistol?
The barrel is probably marked 8,81 and not 8,31.
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