Here are several categories of collectibles that strike me as having similarities to Lugers, and ten-year appreciation figures from 2004-13:
http://247wallst.com/special-report/...-collectibles/
Classic cars 430%
Stamps 255%
Coins 225%
Jewelry 146%
Watches 83%
Hardly conclusive, but IMO tends to suggest that Lugers may appreciate at several times the rate of inflation which I believe has been below 2% annually during this period.