Unusual Chair, solid aluminum legs with walnut  

Not familiar with the chair  but the stretchers resemble the Nelson swag leg desk/table.  Maybe an unpopular design from the Nelson office? An unknown chair seems unlikely to me though.

I think it may be a designer named George Kasparian. I was doing some detective work on a similar sofa, and that is what i found. Love the design. Limited information out there though.
 
http://www.designaddict.com/forum/General-discussion/Sofa-IDand-not-for-...

Thanks a lot for that lead zoomob. This chair once was part of a set that included that same type of sofa, but the sofa was sold many years ago. The paper "Do not remove under penalty of law" tag included a furniture maker's regisry number of CAL-1745, in addition to the "com Herman Miller #451" typed notation. I am working on seeing if I can find out which manufacturer had that registry number. I am not sure what the Herman Miller notation means, exactly..

http://www.artnet.com/artists/george-kasparian/chairs-2-Hy5JKciboMUcjpE1...
Looks like a match.  Possibly it was finished in Herman Miller fabric.

COM is a term that stands for "customer's own material", meaning the original customer supplied Herman Miller fabric for the upholstery as a special order.

Thanks.  I had mistaken com to mean "commercial", so it makes a lot of sense that the Herman Miller notation would be about a Herman Miller fabric. 
I heard back from a California State Office that looked up the furniture manufacturer's registry number in one of their old books, and she said it looked like CAL-1745 had been registered to Metropolitan Furniture Mfg in Pomona, California.  I have thus far been able to find no information on that firm.  I know Kasparian was based out of California, and that his firms, which appear to be Kasparian Originals and Kasparians Inc. (which seems to have existed at least until the mid 80's), were also based there. 

I've had/seen several Metropolitan pieces in the past, all upholstered and all "inspired" by Milo Baughman. Sofas seem to be the most common but I've seen a set of flat bar chairs as well. Well built stuff just not too original design wise. Your chair is a different story though. Love it.

This is a Metropolitan ad page that was for sale on Ebay.  A central image appears to show the sofa that matches the chair at the top of this thread, unless I am mistaken.  Jules Heumann is often cited as a designer for Metropolitan, and I have also seen him cited as the founder.  They seem to have made their base of operations in San Francisco.

...and a sofa for sale on 1st Dibs with the same paper tag as the chair, with the Registry # CAL-1745.
Not 100% sure who the designer is yet, but there is little doubt, if any, that Metropolitan made the chair.

For what it is worth, I have a few California Design periodicals (#'s 8, 9, 10, 11, 1962, 1965, 1968, 1971, respectively).  And they have a few chairs by Metropolitan.  Always the design credit is Jules Heumann, but there are only may 5 or so designs presented.
George Kasparian designs are presented as well, but they are always for his own company, Kasparians inc.  based in Los Angeles.  
 
Finally based on the Jules Hemann designs in the catalog it certainly seems plausible that he might have designed this sofa/chair.

Thanks Leif. There was one Metropolitan ad that cited the "over 50" designs of Heumann that were offered in their catalog. I also have not seen any other designer mentioned in the Metropolitan literature I have seen.