In History Writ in Steel by member Don Maus, p-149:
your markings of "S.P.I.1.80." correspond to the Schupo of Potsdam which consisted of two garrisons.
The I(roman 1) would be the first in Potsdam, the II was Prenzlau and disbanded by 1926.
The 1.80. is a further sub-division and weapon # 80.
Hope this helps, and thanks again to Don M. for his great book.
The info may also be found in "Police Lugers" by Tinker and Gruber.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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