Hi luminox64,
tons of info here on the forum - try the search with "byf" "s/42" "Mauser" and also see many samples at Simpson LTD
http://www.simpsonltd.com/
also dont forget to look at the Interarms 1970s Lugers - esp if you like shiny blue steel
I like Ed's suggestion to try to find a low end collector - perhaps excellent mechanically but with more blue wear than most collectors like, and seems like non-original grips decrease value a lot as does the dreaded import mark etc
mixed serials also drive down the value a LOT - but look for all matching upper on a mismatching lower frame asy - the all match within the upper asy is good idea since that is area of chamber headspace concerns
Im in Wichita now and actually thinking of thinning the herd a bit - but take some time to study and see how that turns out.
Good luck in the quest !!!
thanks
Bill