Given that the sheet of paper beside it on the desk is 8.5" x 11", the approximate dimensions of the steel portion is 18" x 24" x 1.5". The wood base appears to be 20" x 26" x 2.5".
The block of carbon steel should weigh about 183 pounds, but when the milled out sections are subtracted that would leave around 102 lbs remaining (Based on 1.5" wide mills at a 0.25" depth).
The base (looks kinda like oak) should weigh around 28 lbs, although if its southern pine, wouldnt be more than 16 lbs.
The cutter (only functioning part of the whole contraption) would probably weigh 4 or 5 lbs. as it looks hollow.
So my guess is 130lbs.