For those that are relatively new to Luger collecting I highly recommend that you purchase Volume 24, number 4, of the 2002 issue of Man at Arms magazine which contains an excellant guide to spotting Luger restorations by Dave Norin a member of the American Custom Gunmakers Guild. His article goes into great detail on how to spot restorations and is invaluable to the beginning, and veteran, collector. Even Ted leaves a telltale signature that can be spotted. Get it!
http://www.manatarmsbooks.com/oldissue.html
Scroll down to the issue near the bottom.