Well...it looks like it was an F1 hybrid that lost popularity.
Quote:
Royal Flush (Hybrid no. 1) - Breeder and vendor: Ferry-Morse Seed Co. Parentage: Ferry-Morse inbreds. Characteristics: F1 hybrid, early, market type, high yield, compact vine, concentrated ripening, large, firm, smooth, uniform fruit with excellent flavor, light-green shoulder, excellent for shipping. Resistance: verticillium and fusarium wilts and nematodes. Similar: Unique. Adaptation: California and the midwestern and southern United States. 1974.
http://cuke.hort.ncsu.edu/cucurbit/w.../tomatojr.html
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So it has probably slipped into oblivion...