Nice! It probably predates the IBM PC.

The silver paint used to get worn off where people's hands rubbed against it, but yours looks pretty much intact.

The very first part time job I ever had was at...Radio Shack! And the Model 1 and 3 are the first two PCs I ever used. Didn't have floppy drives installed, so everything got loaded from cassette. I wouldn't be surprised if the floppy drives more than doubled the price of the machine.