I had a pair of these in about '96, Not sure if i had a 'dart magic' and a 'smoke magic' or an 'xc magic', but i remember they were great tyres. in fact, the tread pattern on the 'xc magic' looks remarkably like a 'smoke' (yes i know i need to get out more if i can remember tyre tread patterns that i've not seen for the best part of a decade...
a bit expensive on t'ebay here, looks like they're the steel bead versions (iirc i paid about 25-28 for a pair of folding ones over 10 yrs ago)
fairly interesting tho
Ala Carte Ti, Mantra, Attitude, ancient steel Trek