Synonym or breeding number (also FR 242-73) for the grape variety Helios; see there.
There are two grape varieties with this name:
This white grape variety (also Freiburg 242-73, FR 242) is an interspecific new cross between Merzling x Freiburg 986-60 (Seyve-Villard 12-481 x Müller-Thurgau). It is an extremely complex cross, as both parent varieties have also already resulted from a long chain of crosses. A total of around 15 varieties were involved, including Afus Ali, Aramon Noir,...
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Sigi Hiss
freier Autor und Weinberater (Fine, Vinum u.a.), Bad Krozingen