Jacob is.... I'm not sure what. It's listed in the Dual-Coated and Primitives group in "The Knitter's Book of Wool" and in the Other Breeds group in "In Sheep's Clothing". Jacob has an average staple length of four to seven inches which makes it edge into the longwools. It has a micron count of 27-35 which could make it kinda soft or kinda coarse.
The fiber sample I have seems to fall into the softer end of the scale with about a four to four and a half inch staple length. It is dark brown with a lot of gray strands (kemp I presume). Definitely softer than the Wensleydale I spun before it, but it doesn't have the silky feel the Wensleydale has.
I spun this longdraw from the fold for a two-ply and a four-ply sample. It drafted easily and was very quick to spin and ply. Almost boring. Nevertheless, it's nice to work with and I would spin it again.