The best saw handles currently available world-wide are from Flicker Forge. I don’t sell these & get no commission but do heartily recommend ’em. No matter where you are in the world you’ll own a pair for probably less than several hundred dollars after paying shipping and customs. The fitting alternates between felling (with saw horizontal) or rotate 90” for cross-cutting (with saw vertical). They are beautifully finished and they look GREAT! And Alice is very easy to deal with..
Here is a modern Sheffield-made saw handle. Because the rivet is loose, it often drops out and gets lost. The handle has only one hand-grip making it less comfortable to vary your hand position when working at different heights as the kerf deepens.
I suggest you paint each loose rivet with bright paint or fix coloured tape so you may find it more readily when lost. Also carry spare rivets as you will likely need them.
You can retro-fit a bigger rivet and re-turn the handle on a lathe to make it more serviceable. One of the images has 2 vertical handles - I retro-fitted the left-hand one.
Here is the handle I sell. The rivet is 6.5 mm diameter and the split-bolt 10 mm Ø. It is a sturdy item and its sole downside is that it is not so good for felling because the handle does not rotate 90°. That said, you won’t be felling nearly as often as cross-cutting.
The turned handle has TWO hand-grips so offers more comfort than the Sheffield-made item shown.