Hi dawgs - welcome to VK. That's a nice looking set. I think it might be from 1955. Check out the pictures from 1955 here:
http://www.tvhistory.tv/1950-59-PHILCO.htm
The 4128 and 6110 have the same dual speakers. The only one close to the model # you gave is the 51-T2134 from 1951, but I don't think that's what you have.