I went on a research binge for this one, looking for its parentage or anything else.

Meilland specifically called it vermillion in their books, and sometimes bright vermillion. From the pinterest photos of it, the bloom looks like Tropicana, but flatter, more well-formed, with a better center, and more of a creamed-coral vermillion. It is way less harsh than Tropicana's color. A little like the color of 'Hamburger Deern'.

It is possible that it descends from Tropicana. My personal guess is Tropicana x Sonia, or [Tropicana x <Zambra x (Baccara x White Knight)>]

Romantica 76 is an important rose to Meilland. Many of their best descend from it.