Hi Ty, and welcome to the forum...
Actually, some FXO plastic bottom magazines were numbered.
As George mentions above, these were Lugers not manufactured by Mauser, but made out of Mauser parts. It's thought that they were made at a unit armory level or higher out of parts that were considered excess after the adoption of the P.38.
They will have a distinctive mark on the left side of the receiver. This mark helped identify them as not Mauser's responsibility should they be found defective.
These, and their magazines, are rather rare.
If you don't want this one, let me know where it's being sold! I'd like to find one of these...
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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