Hi John,
Mustad calls it a 2XL nymph hook. Their 3906 is called standard length, and they have no 1XL model, so the 3906B is one "step" longer. Back before their S82 designation for chemically sharpened hooks, they called the old 3906B a 1XL. If I remember correctly, that means this #14 hook has a shank length equivalent to a #12 standard length hook. I find this model ideal for bead head nymphs. It would be a little long for non-BH's, IMO.
Google "Mustad 3906B" and look at the Mudhole listing (I can't figure out how to attach it here).