I guess that Spin 2 was built by Jacob Goedecker. Fokker built from 3 onwards.
From the book Fokker Flugzeugwerke in Deutschland 1912 - 1921 - Fokker designations:
- Fokker "Spinne", 1910, monoplane built by Jacob Goedecker, first aircraft, which was at least partially designed by Anthony Fokker
- Fokker "Spinne 2", 1911, again built by Jacob Goedecker
- Fokker "Spinne 3", 1911, first aircraft built by Fokker himself
Don't know if that matters to you.
Cheers