Lugers were produced in "blocks" of 10,000. The first block was numbered 1 - 10000. The second block was numbered 1a - 10000a; 3rd block 1b - 10000b and so forth. Your Luger falls in the "m" block of production. Imperial Lugers repeated the process EACH YEAR, beginning with the 1 - 10000 sequence, followed by the "a", "b" etc. Mauser, OTOH, continued production in sequence continually without regard for year changes.
"byf" was the production code for the Mauser company and identified the manufacturer as Mauser.
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