adneu

I think I might have a 311 table, but not sure. I bought it thinking it was a fw, but it it not, nor a 301, 401, or 500. The measurements on the opening are about 19 1/2 x 9 with about a 2 1/2 depth. It is in decent condition and sturdy. I can't find any markings anywhere on it to indicate what model it is. It has dark brown metal legs, and metal sides with a dark maple (?) top. Just trying to figure out what it is exactly and how much it is worth. I can't find any information on this model anywhere. There is no extension for this one. Can anyone help.