A luger is a luger is a luger, just different.
It may be incorrect, but its still a luger.
I have not read this book, so can't comment on its accuaracy or lack thereof. BUT, many books that don't specilize in lugers use info from the "old" standards and the information is Just wrong / out of date etc. Be advised; most of the information out there on webpages is "reasonably" accurate, but huge amounts is old information, or just wrong....
Value is around $600 for a shooter luger and then add to what someone who liked the scroll work would want to pay? maybe a $100, maybe $1500??
The two sites where luger collectors really show up is here and in Jan Stills forum
http://lugers.gunboards.com although several other forums discuss lugers and do it well. This does not mean that there are not scores of collectors who don't know their stuff and they are just not computer guys. I talk to guys all the time who simply have no desire to come onto the web.
I am no expert, but I do come up with smart / correct luger things to say, because I have the latest books and talk to friends who know far more than I do.
Ed