Mark,
Well done, and welcome to the Forum. This Luger is actually a military pistol, rather than commercial.
The cursive b is actually part of the serial number. Military Lugers were numbered 1 through 9999, and then the sequence started over again with the addition of a letter suffix. Although the actual production records have disappeared, the first observed G date is 930a (Still, Third Reich Lugers), so the gun you are considering is 13,000 or so into the production run.
The proper magazine for this Luger is nickel plated, crimped sheet-metal tube with an aluminum base.
If this Luger has its original finish (not a reblue), Ed's assessment is pretty much right on.
There's not really a "parts-swapping" forum, although people do sometimes advertise for a part with a specific serial number. Most collectors object to this practice, although it is one which occurs frequently.
There is another consideration here. Lugers are considerably hand-fitted guns, and most of the parts, even small ones, are serial numbered. This is to so that all the original parts stay together to ensure that the gun functions. You may indeed find a side plate with the same number as your gun, only to discover that it no longer functions with it in place.
Anyway, glad you made it here, and I hope you enjoy the Luger if you buy it. If you can post pictures it would be great, we all just love to see pictures of each other's Lugers.
--Dwight
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