They look like the chairs in a very popular Mexico City bar I was in in the late 1970s.

Leather sling seat, leather-covered arms, and shallow machine-made carvings ... cantina chairs.

Thanks - was this sling style of chair something that came about early to mid century? They seem to be walnut and are extremely heavy

Your chair is a variation of the leather sling chairs that were introduced in "Danish Modern" style in the 50s or 60s and remain popular to this day. Just imagine the carved wood turned to chrome tubing.

Mexican furniture uses a variety of woods, depending on where it is made. One of their common woods is a relative of mahogany, reddish brown like that, and extremely heavy.

It looks comfortable, but you don't have an antique Spanuish Colonial chair (they look like this: http://newportavenueantiques.blogspot.com/2010/08/19th-century-spanish-colonial-leather_01.html and are hideously ucomfortable)