Fillet brazed frame, Campy Record parts kit, handbuilt wheels, 16 pounds and change. 'Nuff said.
There's a story that goes along with this lug. It involves cutting out the 1 1/4" seat tube socket, collaring an 1 1/8" seat tube to look like the others, then filleting it in while sweat brazing the rest of the lug. There's a story alright, but I'm not telling it.