Daryl, the only significance is that it was a change in the marking. For fxo magazines the mark with the "8" closest to the magazine bottom was only used for the first months during the 41 byf production until about June 1941. The mark was then reversed with the "P" closest to the bottom. The reversed mark was then used for the remaining byf production about mid to late summer of 1942.
I only use it to help date Luger Production.
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