I love Watkins' playing. Koch Jazz reissued the two Atlantic albums, Fresh Sound has the two Dawn albums with the half one added to the first as a bonus. The Mercury is nice, if you love french horn. I recently found a pristine copy of it, sounds great. And do not forget his two Blue Note ten-inchers.
Gunther Schuller once said "If anyone can do it on the french horn, it's Julius!"
https://jazzdiscography.com/Leaders/WatkinsJulius-ldr.php