Most Sk1 is sweet floral, with overtones of skunk, and/or cat piss. It all comes from the sulfur molecule Im pretty sure. It can also be cheesey as we all know from UK Cheese. The genetic pool of the original sk1 is much larger than whats around today, is more stable as far as phenotype structure goes, and is one of the best strains there is for breeding, as it brings stability, and a strong branching pattern. Original Skunk1 had 5% deviations, though the Terpene Profile can vary greatly. Theres a reason it was used in so many breeding programs. Same for NL5, and Haze. PNW Hashplant.
Its said one is more likely to find stronger terpene sulfur profiles in the old Super Skunk, of which Im not sure which Afghan they back crossed it to. Could be Afghan#1. The best of the best Afghan #1 was crippling, with a grape smell, and hashy taste. Super Choke. Many didnt like it. Killer stuff.
I grew some Afghan #1 out 4-5 years ago, and was junk.