I suspect that it's this one:
https://www.gunbroker.com/item/926260654
It's a put together FrankenLuger and totally bogus. By late 1917 the fine tune front and rear sights on the Artillery had disappeared, replaced by simpler and more easily manufactured sights.
The subject Luger has been refinished. The receiver is a 1918 Erfurt so the barrel is definitely a replacement. The frame is also Erfurt. The "matching numbers" were force matched during the refinish. If someone wants an Artillery shooter then this would give them the experience of an Artillery but it's certainly not a collectable.