That is mahogany, probably Honduran. From a distance I could see why
people said Walnut but if you zoom in you can see the "dashes" in the
grain that are either Teak or Mahogany and this aint Teak.

Since you are in San Jose you could go see some work I was involved in
at Vintage Wine Merchants in Santana Row. All Mahogany. Lots of it.
100's of thousands of $'s worth (labor included of course). We did the
entire place in Mohagany, all the case/rack work, the bar back (I think
someone else did the actual bar) and even wrapped the entry way columns
and beams with furred out Mahog. Over the few months it took to do it I
became very familair with this wood. We used an oil varnish finish on
lots of the stuff (no stain) and it looks just like the piece you are
showing.

Look at http://alohacabinetry.com/gallery5.htm and click on the picture
showing the bar. Make sure to click on the MORE button at the bottom
for much MORE of this same site. All Mahogany.

BW