On my Fobco bench drill I have a 1/2" Jacobs No. 14N Ball Bearing "Super Chuck". Bought s/h for a good price from a dealer at the London Model Engineering Exhibition. It's a very nice chuck, but heavy. Needs a good whack to keep the MT arbor up in the quill.
On power drills where the original chuck was u/s or worn, I replace them with Metabo Futuro Top keyless chucks.