A late-season, reddish-maroon skin, reddish-yellow flesh, interspecific plum. Origin: Zaiger Genetics, Inc., Modesto, CA, by G.N. Zaiger, L.M. Gardner, and G.G. Zaiger. 57RC99 =(King David, Queen Ann, and Casselman plum) × 4G1180 plumcot; selected 1996. USPP 16,590; 30 May 2006. Tree: medium; vigorous; upright; heavy and regular producer; self-infertile; anthers yellow; blooms 26 Feb. to 6 Mar. in Modesto; chilling requirement 800 h. Fruit: medium, 60 mm diameter; 119 g; cordate; skin reddish-maroon, glabrous; flesh reddish-yellow, 18.2% SS; clingstone; ripe 10–17 Aug., 10 d after Casselman.