Butler's antique table by Derexel Heritage 18th century

This table is the size of a coffee table but a few inches higher. It has four legs and the wood criss-crosses one leg to the other.  It has 4 leaves that fold out. Under the table on the bottom is a stamp in white letter that reads:  

138-117-3

18th Century

By Drexel

9  84

It is a dark wood and in the center of the table on top you can see almost a "cross" as though the wood grain goes in a different direction.  It is a beautiful table and I am wondering how much it is worth?

thank you,

JoGoPray