In response to Retired Guy
You are quite right in your comments - and I have actually made an overweight landing in a B767-300. Large fleet with a few early examples not fitted with fuel dump. Followed the procedure in the QRH as the alternative was a long time at low level trying to burn off the excess fuel. It was a non-event and aircraft was cleared after inspection.
Reckon they rushed this and managed to forget the dump switch.......