That Reynolds 853... drool. When I raced mountain bikes a couple decades ago, that was what my hardtail was made of. Just 20.5 lbs for a steel frame bike was nuts at the time, and that bike was a rocket ship.

Still have it. My son wanted to try it one day, his response was "that bike wants to go fast"

Edit: I also had aluminum (too stiff) and titanium frames (too flexible, or floppy as I called it). The 853 was excellent