What can I tell ya, the Colorado penal code clearly says, and I quote-
Section 18-12-102
(2) As used in this section, the term "illegal weapon" means a blackjack, gas gun, metallic knuckles, gravity knife, or switchblade knife.
(4) A person who knowingly possesses an illegal weapon commits a class 1 misdemeanor.
Section 18-12-102 provides no exceptions for collectors, or keeping switchblades at home. The term "possesses" as mentioned in sub-section 4 appears to be all-encompassing. The only exceptions are for law enforcement and military personnel with a valid permit.
Personally, I would follow the letter of the penal code rather than the word of some guy at a gun show. It's also not at all uncommon for illegal items to be sold, both at gun/knife shows, and in retail stores. I read a case recently, I'll have to check the location, but a retail store was illegally selling switchblades for several years before they got caught. The owner of the store claimed he had no idea they were illegal. EDIT- Here's a link to a thread here at Bladeforums on the story-
http://www.bladeforums.com/forums/s...ngly-sold-switchblades-illegally-for-20-years
Of course, when in doubt about the law, people should consult an attorney. What they should NOT do is risk their freedom and financial security on the word of a total stranger, either on the internet, or at a store/gun show.