I can give you a start, Phillipe.
The P is stamped on pistols that were decommissioned from the military and made available for Public sale.
The U notch strikes me as something the Swiss may have done to improve the traditional, crappy sight picture, IIRC.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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