Curt, that is not an easy police marking to identify. Are you certain the "P" is not a poorly stamped "B"? S.B.O. stands for an eastern district of Berlin (page 92 of Don Maus' History Writ in Steel). If you are positive that the marking is S.P.O., then on page 330 of the same treatise, it is listed as a possible Sicherheitpolizei or early Schutzpolizei marking. Some markings were mysterious and not identifyable even today. Perhaps someone else, even Don, may be able to contribute something here.
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