[size=+1]Your scraper appears to be a clone of a Stanley #12, as others have said. It does appear to be missing the two adjustment nuts for the blade angle.
If it's a true copy of the Stanley, the threads are some off-the-wall size, so good luck duplicating them on your lathe. Maybe you'll bet lucky, and Smith used a standard thread...
In the alternative, you could make a complete new shaft - maybe 5/16' x 18 - and then you can use a standard tap for the nuts.
Hock and Lie Neilson both make aftermarket blades for the #12. As others have said, it's the same blade as the #112 uses, and it's generally bevelled at 45°, and used with no burr.
The #12 is a pretty good scraper. Yours is definitely worth fixing up.
BTW, the original Stanleys had a rosewood handle. Yours appears to be something else - maybe maple?[/size]