It's a bit fat and heavy for a screwdriver, with the diameter being about 3/8". Overall length is just 8". I suppose it could have been a much longer shaft that has been cut, as mentioned, but if that were so I would expect the handle to be larger for a shaft this size.
I couldn't see any other markings other than the Craftsman name. I even held it in the light to see if there was a number or anything that used to be there but had just lost it's paint. I could not see any sign of that either.