Hi Allen, and welcome to the forum.
I have one from the "m" block which very likely dates to 1923, so I would estimate 1925 or so for your pistol. Others may have more precise tables.
The "p" block was close to the last of the DWM Alphabet Commercial pistols. I believe the "r" block was reserved for special orders. By 1930, the line had been disassembled and was being moved from Berlin to Mauser's facility in Oberndorf.
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