ok, let me try to answer a few of the questions above and add a few more pictures. The back is constructed of multiple planks as shown in the attached picture. I pulled a screw out of the back and took a picture of it. Looks machine cut to me. I took a picture of the caster if that helps anyone. I also took a pic of the back side of the top crest (it is definitely oak). The odd thing here is that it has both of the stamped names printed on it which pretty much blows the idea that these may represent old packing crates used in construction. Also, note that the J Roberts stamp has been crossed out with a blue crayon. I found this same thing with one of the other J Roberts stamps on the piece. Now I am completely mystified as to what these stamped names mean. On closer inspection I found old finish that had been stripped in crevices on the piece. It has definitely been refinished at least once. The top crest may have been refinished at a different time with a slightly different color. Sooo, I hope this additional info will help you guys with the date issue. If I sold this, how much do you suppose I might get for it.
As always, thanks for all your input