Sorry for the jumbo XXL sized photo of the round.
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I agree it could be / probably is a commercial. I've seen several "commercial" Lugers that were sold during the interwar period in .30 or "30 Luger". It's a bottle necked cartiridge. IIRC, Germany was forbidden to sell 9mm Lugers between WW1 and WW2.
Lugers, like 1911s only need a standard screwdriver to start taking them apart, then every other piece that has to come off or come apart can be managed by another piece of the pistol. There are some good videos out there on disassembly and reassembly. IIRC, the mainspring is tricky either coming out, or going in, or both. I've stripped a few completely, but I did use other tools. Wish I'd kept one, even a .30.
If the base plate of the magazine is wooden, it's worth more, as it's period correct.