Hi Wm,
I have a different looking smaller aftermarket one that I removed, cleaned up, & reinstalled -- it is a 6V electric wiper with no switch that came with my 1930 Briggs Town Sedan.
After removing all of the caked grease & re-lubricating it, I found that it removes rain from my windshield about as efficiently as a Popsicle stick attached to an 1890 Grandfather Clock Pendulum.
My "original" 6V electric wiper from e-bay moves at just about at the same slow speed & is not great during rain.
Took advice from former replies herein & resorted to Rain-X which works much better than my 6V electric wipers.
Just a word of caution in case one may get interested in any type of very expensive vintage 6V electric wiper seen on e-bay.