seeking referrals for antique mantel appraisers

From a Rhode Island Avenue NW resident:

We`re wondering if any Bloomingdale residents know of and can recommend someone who appraises and purchases things like antique mantles. We`re thinking of
removing a large mantel in our house that has a mirror and glass door cabinets. It`s a really nice piece and we may not end up parting with it, but we have no idea where to start a process like this to see if someone would buy and then remove it.