This is a puzzle in more ways than one.
The ID plate looks absolutely original, but the date on it, 1958, has been overstamped, with "8" over "9". This suggests to me that this car was actually finished in 1959.
Being unfamiliar with their numbering sequence, I'll ask if it's possible that the car is #0001 for the year 1959 production run...whether that run was realized or not?