Antique Very Large Turnscrew/screwdriver

Description

16 1/2 inches long overall
Blade 9 inches
Handle 2 inches wide
Blade has interesting shape as does handle
Brass ferrule
Some surface roughness on blade
Small split on one side of handle by ferrule
Handle has been hammered a bit
over time
What appears to be "A.Rushworth" stamped on handle and blade
Please see pictures for condition
Thank you for your interest.