Hi Andrew,
Here are some Swiss M1929 Lugers for sale with FGS out of Ohio State. Scroll down towards the bottom of the web page.
You can see the pricing variation based on original condition, matching parts, finish remaining, bore condition, and whether the Luger is the more common military-issue or the more rare commercial variety.
http://www.fgsinc.8m.com/photo_4.html
As Ed mentioned, seeing your gun's photos will help a lot...
Simpsons LTD out of Galesburg, IL also has several M1929's for sale...go to pages 1-2 in their Swiss Luger offerings.
http://www.simpsonltd.com/index.php?cPath=179_216
Keep in mind, these are dealer/retail prices and asking prices is usually not selling price with some dealers...