Berkey & Gay Dining Set

This dining set was from my grandparent's formal dining room. My understanding was it was bought in the late 1920s or early 30s. Our family received in in the mid-1960s. I have been told that it is mahogany, but I'm not sure. There are 6 chairs in the set. The table is in good condition (some surface blemishes) and measures 46" x 60". There are 3 leafs fior the table as well. The buffet is in very good condition and measures 71"w x 22"d x 37"h. The chairs are also in good conditiion, but they're in need of another recovering and could use some re-glueing around some of the post/hole connectors. While I'm interested in a appraisal, I'm also interested to know about more about this style of furniture. Thank you.