From the US patent of:

DESCRIPTION
CROSS REFERENCE
The rose in this same breeding program that most closely resembles this new invention is ‘Poker Chip’ (U.S. Plant Pat. No. 4,582, expired). The plant habits of these two plants are similar, both being well branched and growing twelve to fifteen inches tall and about two feet wide. Both have flowers of red and yellow. The diameter of the open bloom on ‘Poker Chip’ is 1¾ inches and on this new invention is 1½ inches. The differences are in petal count, ‘Poker Chip’ having twenty-five to thirty petals and the new invention having ten to fourteen, plus the coloration of those petals. The abaxial surface of both is yellow but the upper surface of ‘Poker Chip’ is primarily red while the upper surface of this new invention is yellow with red near the margins. The relationship between these two plants is with both the seed parent and pollen parent. The seed-parent of the seed-parents of both cultivars is ‘Little Darling’, U.S. Pat. No. 1,581, expired. The pollen parentage of both cultivars is also similar: The pollen parent of the new invention is ‘SAVachild’, (U.S. Plant Pat. No. 8,175), whose parentage is ‘Yellow Jewel’ (U.S. Plant Pat. No. 3,827) by ‘MEIdanu’ (not patented in the United States). The pollen parent of ‘Poker Chip’ is an unnamed seedling of the same cross, ‘Yellow Jewel’ by ‘MEIdanu’


This makes everything confusing, but one thing is clear. Saville seemed to use Yellow Jewel x Tamango, not Yellow Jewel x seedling of Tamango.