If you are interested in Mauser Lugers, get Don Hallock and Joop Van de Kant's
"The Mauser Parabellum".
It's a year by year inventory of the variations of Mauser manufactured Lugers.
Since this is a Krieghoff thread, check out the book Randall Gibson published
"The Krieghoff Parabellum".
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Back on the OP topic, I also wish I completely understood why demand for Krieghoff Lugers is so much higher than the rarer Simson & Co. pistols. Perhaps it is the allure of the Luftwaffe... Even respecting John and Ed's comments above, the Rust Blued Simson Lugers are well made, with excessive attention to detail (with individual parts all inspected and marked, down to the screws).
Marc
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.