Can anyone recommend an appraisal service that specializes in antique (1700/1800's) firearms?

Especially useful would be a place in PA or Ohio.

Thanks in advance.

I recommend you contact Ron Peterson at Ron Peterson Guns Inc. 4418 Central Avenue Southeast, Albuquerque, NM 87108 505-255-8695. For years he's traveled the country doing appraisals. If he can't do it for you he'll know someone who can.