Without any further info like a part number, I'd tend to agree.Looks like a makeshift depth gauge to me
Like was already asked what is part # on the handle
I have a Craftsman P4 screwdriver that is a beast if you want I can take an OD measurement of the shank for comparison with a caliper.There's nothing else printed on the handle.
The end may have been cut off, because it's not very well finished, but the entire steel shaft is much thicker and heavier than any screwdriver I've ever seen, at least relative to the size of the handle.