The website Jalopnik has the story, which begins this way:
The first Porsche ever built has been untouched since 1902. Officially called the Egger-Lohner C.2 Phaeton, this electric car from 1898 has 'P1' engraved onto all of the key components standing for Porsche 1, done by the then 23-years old Ferdinand Porsche himself.
If you love cars, or just cool history, check out the story, which includes many great photos.