Yes the legs are chamfered. They have a little scallop at the start of the slight chamfer about 1/8" wide. You can just make it out in the third photo.
I have attached a full size photo to this reply so you can see the chamfer better.
Your post got me to wondering about this vice as well and I found this information at anvilfire.com. C&P Identification of Vises:
It is more difficult to find out about old leg vises than anvils, because there were fewer markings. When Peter Wright did mark their vises, they did so on top of the screw box body with P.WRIGHT PATENT SOLID BOX. These were in three lines, stamped in small, serifed letters and were often obliterated by wear and rust. The stamped letters were a matter of pride and the result of a break through in technology. The earlier boxes, I assume throughout Europe, were composites made up of multiple "rings" forge brazed around a forge welded tube. The square threads consisted of a coil brazed inside the tube. Normally, brass spelter was used rather than copper, as the brass melts earlier than copper. After brazing, the internal threads were cleaned and the external box was lathe turned. On close inspection, one can see evidence of brass and/or slight separations where the rings are joined.
The Peter Wright firm figured a way to eliminate all the composite brazing business, and was able to make a solid box with internal threads. The Peter Wright vises exported to the U.S. most often had deeply chamfered legs. When I was in Australia, the PW vises most often had very slight chamfers on the legs. Some of the Australian PWs had the royal coat of arms stamped on them. I suspect that the Australian imports were made at a later date that the U.S. ones. In all other respects, the Australian and U.S. Peter Wright vises appear to have the same conformation.
Frank Turley - 05/29/08
Edit: Mine does have the royal coat of arms on it, so that leads me to believe that the one I just got was an Australian import version.