Teak bar cart  

Here's the modular setup

Here's the underside of the bottom tray, which is stamped with "48".

Hmmm . . . I've seen a lot of MCM bar carts, but neither the tray edge profiles nor the hooded casters look familiar to me. Could you more more photos of 1) end edge of a tray, 2) closeup of wood grain, and 3) the casters?

Are you sure it is teak?

Good question - maybe it's not teak? I'm not expert enough to say, but would love to know. Here's a better picture of the side:

The top tray is mounted using aluminum sliders.

A better picture of the top

A better picture of a caster

And a picture of the end edge

Patinaed teak and walnut can be difficult to ID sometimes. If you zoom in with a camera or magnifying glass, the canals in walnut would be straight, while the teak canals would be squiggly (when viewed in side grain).

I also looked around for those casters, and French bar carts with the same casters popped up a few times. 

If I were to make an educated guess right now, I would say your bar cart is mid-century French walnut.

Thanks for the response. Here's a closeup of the grain from the surface.

Another closeup