Looks like a good shooter. I have it's cousin in the M range. Quoting partially from Still's "Weimar and Early Lugers'. .".. . the alphabet DWM Luger was produced from 1921-1928 from a combination of new and surplus parts." Letter range is from i to r. Estimated production 90,000. (I hope I'm in the right table).
Here's more on disassembly:
http://www.wonderhowto.com/search/luger/
And this may tell you the worth. Remember these are 'retail' prices. I paid $1000 for mine. Looks to be identical condition to yours.
https://www.simpsonltd.com/index.php...fdfdbebfdb1f95
You may have some troubles with the firing pin not cocking for the second shot. I did. But the fix is a sticky under repairs section. Very easy to do.
FN