> But what about that reference to Oscar Egg lugs? Are those?
Look like Nervex Legere to me. Like a simplified Pro. The sides look just like a 70s Motobecane Grand Record. For the flourish on the front of the head tube, go to http://www.classicrendezvous.com./France/Nervex_lugs.htm Scroll down to the Legere series, and look at the 5th one over, top row.
Also note "There were over 40 designs available in the Nervex Legere Series", so even if it isn't a perfect match, I think the familial resemblance is unmistakable