Antique/Vintage Dark wood Rockingham expandable Dining Table - Has 6 original chairs & 2 Leafs

Please help me find the right information so I can sell this table asap!  I can't find a thing helpful online. 

My friend gave me this table as a gift, saying her father had stored it after it was passed to him by another older family member, then finally gave it to her.  She didn't want it because she is estranged from that side of the family, so had stored it in her attic until she offered it to me when I needed a table for my new apt a few years ago. Its never used, and way too big and takes up so much space.  I'd like to sell it and buy a smaller, more modern table for my little family, but cannot find ANY information that will help me date this table, or figure out a reasonable asking price.  Any help would be so much appreciated!