Corona pale lemon, with rim rolled.
A description according to “Rathowen daffodils” 1973 catalog: “Bred from ‘Sincerity’ x ‘Cantatrice’ this is a flower of superb quality and size. Board smooth pure white overlapping perianth, standing at right angles to the pale lemon trumpet which is nicely rolled at the mouth.”
There are no photos of "Hillsborough" in Daffseek.