Okay. According to ads and editorial copy in the 1965 Seventeen magazine, Tuffin & Foale designed for Youthquake under the Daphne label. Mary Quant designs were under the Barnsville,USA and the Young Naturals labels. I've seen Barnsville labels (which actually was trademarked by Puritan in 1961), but not with Quant's name.
The early Paraphernalia labels always have the designer's name on them, and since youthquake was hatched from the same nest, it stands to reason that the designer names would be on the labels. And Puritan was pretty savvy, cashing in on the trend when they did. But, I do have that red, white and blue label with no designer, and it is definitely a mid 60s dress, and I presume was designed by someone who really "knew" mod.
So it's a real puzzle.
Lizzie