Tumbler, wax cast steel, tempered, tapped 6-40. Fly pocket is now on the outside face of the tumbler.
Early versions of this tumbler have a smaller bridle axle. If the bridle axle is considerably smaller than 0.155" diameter then you have the early version. L&R recommends you should also replace the bridle, or enlarge the existing bridle with a #21 drill bit.