The Canadian Rose Annual (1992) states the following:

"BILL SLIM, F (Harkness '87 int '89) [(Highlight x Color Wonder) x
{Fragrant Cloud x {Mischief x (Red Dandy x Buccaneer)}} x Silver Jubilee].
PB (pb). Rood (2 pis 2 yrs 3' ON): Outstanding medium red, almost the
colour of summer tomatoes, so bright and cheery. Trusses of well formed
blooms, repeats well, very fragrant. Excellent foliage, complements colour of
the bloom well, no disease, winters well. "