The Huret Jubilee was quite light even before they drilled the holes. Hole drilling was the method of choice in the '70s for reducing weight and there were all sorts of flexy drilled-out components available. If I remember properly, the Zeus (was it 2000?) derailleur was also light because it had investment cast steel parts (thin) and Ti bolts. I have the regular version of this derailleur (criterium) and it doesn't shift bad, but rather like an old campy record. This isn't surprising, since it appears to be a copy.