I'm still trying to find out what collection our American of Martinsville bar was part of, but after many hours on Google I might have to call this one done, without an answer.
I'm having such a hard time because it may have been part of multiple collections. It at least has many uses:
The second piece of a bench
The top of a buffet
The bottom of a book shelf
And it seems that in some cases it had legs, but in most it didn't - ours doesn't. That's one very versatile mid-century liquor cabinet.