John, a practical question on this great thread what is your preferred method of cutting the mortice for the tapered tang?Thats a nice looking old chisel. As to handle then whatever you like really. If you have a lathe then either design your own or copy an old handle you like the look of. Without a lathe then something 8 sided. Use a hardwood. Ferrules can be bought or just cut some metal tube.
There are chisel handles for sale but will not really look the part on a nice old chisel like that.
Most of my chisels are old vintage ones I rescued and have had to make quite a few handles. My dad was a carpenter and always said Sorby chisels were the best.View attachment 114628
More than half the chisels hanging behind the bench I had to make handles for. As long as it feels good in the hand and I like the look of it then its ok with me.