I am trying to ID the history of a Luger 9mm for a friend who knows even less than I do about these pistols. It has a 4 digit serial number 50**. The same full serial number appears on the reciever as well as under the barrel. The last two digits of the serial also appear on several of the smaller parts that are visible from the outside. On the top of the reciever just behind the barrel is 1914 stamped in. On the bolt, which has the same last 2 serial numbers on it, it also has a Crown with the word ERFURT. Scattered over it are other smaller stampings, some in script some seem to be pictures. Without something to compare it against, I can't make out what they are.
Here are a few pictures, anywhere you can point me to find more info would be appreciated as always.