This has come up for sale locally, listed as left or right sided.
This is a photo of the left side of a normal hogs.
Would it be 1925 for removable bands, maybe an early version. Heck if you can adjust the reverse and brake from outside the hogs head why not the low too.
Here is a right side hog head on a 1912 engine converted to an electric starter motor.
I've seen others just like this. One theory is that E. W. Brown did the conversion for his Palm, Renown, and Spark cars. I have a similar cover which came with what is believed to be a Renown motor.