While serial number are helpful, they must be recognized as generalized ranges of production. The serial number ranges of the PPK and the PP run concurrently from the beginning of manufacture. Between the numbers you listed are reported PPs and PPKs. Some collectors have kept data bases of reported serial numbers which help fill in the generalized range charts. For example, PPKs of the contract marked (P)xxx are reported in the 773xxx range. This example is serial number 773455.
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