Swiss Alphabet (1921) S/N 2049 i, has a "20" in the same size font at the bottom where the trigger pin cut out is found. It also has tiny "1" in the middle of the plate, but sideways and of course, nothing on the outside.
1917 DMW LP08 = S/N 803 c, has an "8" in the Trigger Pin cutout, just like my Swiss, and it also had a "1" sideways in the middle of the plate. The outside has the "03" you would expect.
"byf" 42, S/N 2011 l, has a "27" inside and the "11" outside.
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