Synonym or breeding number (also GM 49-34) for the grape variety Breidecker; see there.
The white grape variety (also Geisenheim 4984) is an interspecific new variety between (Riesling x Silvaner) x Seibel 7053 (Chancellor). The parent variety, however, has nothing to do with Müller-Thurgau, which is wrongly named in some sources (apart from the fact that Silvaner was not involved in Müller-Thurgau). It...
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Roman Horvath MW
Domäne Wachau (Wachau)