If I may give you some more advice, a dealer cannot function as an objective appraiser due to conflicts of interest, just as an ethical appraiser is unable to function as a dealer.

For example, your "Colt" might well be worth $4000 now or later, but your dealer friend might have told you that your it was worth only $2500 so that you'll gratefully accept a crisis offer of $1800 for it once your manic phase ends and you need to raise money to pay off your credit cards. The dealer will then turn around and sell the "Colt" privately to a collector for $4800. This kind of thing happens all the time.

I'm just a well-meaning stranger on a mental illness forum who chose as an avatar a minor character from a children's television puppet show, so please refer to this link:

Everything You Want to Know About Appraisals and Appraisers