I have two acoustic guitars, one 6 and one 12' both custom made for me by Andy Adams. Andy passed away a few years ago, therefore these are the only ones available. I have pictures, documentation and appraisals from Mandolin Brothers. How to sell?

Also try a couple of places in Catonsville, Appalachian Bluegrass and Bill's Music.

Same info as provided by others, just walk in they'll show you what to do, but be warned you will probably either a. Become enraged at the about they offer you, or b. You sell a valuable instrument for pennies on the dollar.... I hope it's a good experience, but you may be better off posting on Craigslist, letgo, eBay, ect. But you might as well get GC to give you a quote.

Just right up at the front desk

Go to Guitar Center and have them appraised.