Hi and welcome to the forum. Start by studying the reference material we've gathered and published for free in the forum's FAQ document.
http://forum.lugerforum.com/showthread.php?t=13121
You'll find it ever useful as you become familiar with Lugers.
Your Luger has a number of unusual proof marks that I believe may be from the Birmingham Proof house in England. Others that know the marks better will confirm or correct me.
The text on the side is not readable, but may be an American import mark.
I find the finish hard to judge. The gun may have been reworked and refinished at some point.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.