Hi
martl ,
Have you considered Columbus EGO tubing? Perhaps your frame is built with this tubing. You say ovalized, but not quite MAX tubing. I have a Concorde frame with Columbus EGO tubing, but my top tube is oval on the vertical at both ends (at head tube and seat tube lugs). Same with down tube, oval on the vertical at both ends. Just wanted to throw this suggestion out there. Hope you figure out your tubing.
aceves