http://scarboroughmarshfurniture.com/public_html/antique%20morris%20chairs.html

Neat !! You have a version of the Morris Chair !! The link will give you a little info !! There were many of these chairs made with many versions of the back bar and rest !! I am not sure the initials you found are for any furniture mfg company !! Tons of these chairs were sold, and given as premiums and assembled by the owner !! All the parts were made by different companies !! If you can find a patent number on the metal parts you might be able to find the company that owned that patent at the above links patent page !!