Nice. It’s the same as mine.
https://www.retrobike.co.uk/threads/87-cannondale-or-should-i-say-haringdale.249948/
The SM600 was available either as a 2x26” or a mullet. 26” on the front and a 24” on the back.
Nice and tidy example. A few non original parts plus a few scratches here and there. Overall in good working condition but I’ve not dismantled the fork.
£250 plus the postage.