Hello Steve

LEt me know what sizes you are interested in and I can let you know what the differences are between the 3906B and the S82-3906B.

As for why each has different nomenclature, Bamboozle pretty much nailed it. There was no set standard back in the day so the rating of strength and length are all over the place on some of the Classics while with the Signature series, we set the R50-94840 as the standard length and standard strength hook. All other hooks in the series are compared to this hook.