The Prussian Interior Ministry Directive of 5-April-1922 lists P.Bg. as the Brandenburg Police School. This would be weapon# 680.
Brandon, track down the book "German Small Arms Markings From Authentic Sources", Joachim Gortz & Don L. Bryans, Walsworth Publishing Co. This volume contains the Luger marking material which can be found in Still, but much more expansively as it includes the entire texts of the directives beetween 1909 and 1935. Its an amazing compendium of information, covers all small arms and accessories (not just Lugers), and is extensively illustrated. The answer to almost any marking question can be found here.
--Dwight
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