Bob,
Yes, this appears to be a first-generation 513 going by the non-swiveling top cord hook. As a result, the motor on the nameplate should read 3 amps.
During the 513's run the top cord hook changed so it swiveled, to ensure quicker cord release. The motor also increased power from 3 to 4 amps.
Regardless of version, the gray cord with red plugs is not original... that first showed up on the model 516. The original cord for the 513 was black with a round female end (for models 514-515, the cord would be gray with round female end).
~Ben