Please help identify this 1970's or 60's couch  

Don't Know
...but it looks beautiful!

May be Dunbar
Looks like it might be a Wormley design for Dunbar. It's obviously been reupholstered and they usually are marked in the decking or with a fabric label which is often lost when reupholstered. You'd need more detailed shots to compare, (the stretchers between the legs, etc.) but at first glance, it's close to a Wormley sofa I've had before.

thanks, there is quite a few similar couches on first dibs
these two being the closest I could find, I will uncover the bottom and post a few additional pics, thanks again for your help.
http://www.1stdibs.com/furniture_item_detail.php?id=344941
http://www.1stdibs.com/furniture_item_detail.php?id=275902

Additional pics
I uploaded a few additional pics of the underside, please let me know if this helps. I didn't see writing or an identifying mark on the underside.
http://www.flickr.com/photos/45878631@N08/4226608578/
http://www.flickr.com/photos/45878631@N08/4225840231/

Looks like Dunbar
Just saw your photos of the internal structure and that kind of construction is typical of Dunbar.

I don't think it's Wormley
I have a Wormley and the only three-legged config he did did not have the arms coming all the way out to meet the seat deck. Maybe another designer for Dunbar? Or a copy.