Lyman still makes the molds today but the number is 427098. I do not know why, or what mods took place. What I have noticed is the diameter seams to be a consistent .429 and the forward driving band is more pronounced. This is the mold I use now days. A handloader crimps on or forward of the driving band. Any deformations applied to soft lead during the crimping step are almost a mute point due to the batter expansion of the soft lead into the driving bands. All of the above bullet molds are used with black powder since the base of the bullet sits on top of the powder preventing the bullet from telescoping back into the case from the rifle magtube spring tension. Crimping forward of the driving band  smooths out injection into the rifle chamber from the action lifter for finicky rifles. Cast bullets of the black powder era did not require a crimp groove, because a compressed case full of black powder prevented bullets from telescoping into the case under magazine spring compression. Crimping the case mouth over the ogive was sufficient to prevent inertial dislodgement in revolvers, because .44-40 loads have milder recoil than their modern, smokeless powder, magnum counterparts. ~Ed Harris​

Dissection of a few early bullets show only a slight roll crimp and noted only about .007" deformation from the crimp into the soft lead.