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Jeff OTo the best of my knowledge, the "Delicate Aroma" back is only known on 5 cards in the 175 series: Berry, H. Smith, Tonnesen, Krapp, and Brown (Vernon).
There are 5 backs which are more scarce (known on less subjects) than "Delicate Aroma". They are "Instantly Popular" (2 subjects), "Just Right" (2 subjects), "Immensely Popular" (4), "Mais Paper Wrapper" (4), and "The Story in Smoking" (4).
What's interesting is that the "Delicate Aroma" back is known on 4 different subjects on with the 150 subjects back.
Jeff