Ok.
Nervex lugs were widely used, therefore common and not very special-they are nice lugs though.
However many of the top builders,"the premier league"if you like, modified these lugs and they then became something in an entirely different league.
Sometimes the modification might have only been to reduce what I refer to as the shoreline: where the lug meet the tube, call it the"cliff". Sometimes this was made more subtle, thinner, less of a step.
Sometimes the modifcations were more radical and became the trademark of that particular builder.
The lugs on this frame have just been brazed up; out of the box, onto the tube.
Does that help?
Maybe Old Ned can add something; he's very knowledgeable.
Roadking.