Yes Rick, Jim, I agree that with old ingravings accuracy varies so much, but the tulwar grip in that one looks a bit unusual! so artistic licence may play a part.Looks like a form of Zaghnal almost.
Heres the ww1 Brit. entrenching tool
I have the head from one, Id guess the head weighs about 24oz max., it is very effective for digging through roots & hard clay soil etc.
Spiral