My first commercial Luger
 

My first humble attempt at acquiring an all matching Luger. It is a 1920 commercial (correct?) model. I haven't fully disassembeled it yet, though from what I can see so far the receiver, barrel, toggle, side plate and trigger are all matching serial #6193n. The grips and takedown lever aren't numbered, should they be?
The magazine isn't marked and the wood is cracked. Also the toggle won't hold open. I'm not sure if that is magazine related.
Here are some pics:
http://i23.photobucket.com/albums/b3...1920Luger1.jpg
http://i23.photobucket.com/albums/b3...1920Luger2.jpg
http://i23.photobucket.com/albums/b3...1920Luger3.jpg
http://i23.photobucket.com/albums/b3...1920Luger4.jpg
http://i23.photobucket.com/albums/b3...1920Luger5.jpg

Your TDL and side plate should be numbered on the lower edge with the last 2 digits of serial. Also it appears that your extractor has been replaced and should have the last 2 digits stamped inside. TH

How can you tell the extractor has been replaced?
Thanks!