Mauro,
I was wondering if your research has led you to a determination of the serial number range for the "change-over" variation 29/70 noted on page 10 of Mr. Allan's book. According to Allan, this lot of 65 pistols was "completed using whatever Swiss Model parts were still available and substituting P.08 model parts where necessary and possible. All 65 guns received five-inch .30 barrels and were imported by Interarms."
I recently examined a Parabellum that may be from this lot:
SN 10. 459X, Swiss frame, .30 cal. 5" barrel, P. 08 safety lever, American Eagle chamber, "Original Mauser" toggle, dated 73 with eagle/nitro and ulm proofs.
http://forum.lugerforum.com/lfupload/9766763441.jpg
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thanks,
John