The white grape variety is a new variety between Muscat d'Hamburg x Szölöskertek Királynöje (Queen of the Vineyards), which was confirmed by DNA analyses carried out in 2010. Synonyms or breeding numbers are California K 4-19, Erli Muscat, Early Muscat and Muscat Rani Bijeli. The cross was made in 1943 by Dr Harold P. Olmo (1909-2006) at the University of California in Davis. Plant variety protection was granted in 1958.

The early-ripening vine produces white wines with aromas of peaches and oranges and a subtle muscat flavour. In California it is used exclusively as table grape, in Oregon it is also used to make wine.
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