Question on George Nelson Bar/Sideboard  

Hi, I've recently obtained a Herman Miller/George Nelson bar (or sideboard) for which I can't find any information.

The piece has a lift top and two electric plugs--for a blender perhaps?--inside, has a teak finish, and is on metal legs. Measurements are 42" high, 56" length, and 18" depth in terrific condition. There are several shelves inside as well. Does anyone know the line, year, or value of this piece? It is signed by George Nelson and has the Herman Miller label but I haven't seen this piece anywhere before or in my research. Many thanks.