The 1963 model year officially introduces the VBB2T as the successor to the Vespa 150, but not much actually changes. Besides minor modifications to the SI 20/17 carburetor and a new contour of the frame around the license plate area, it's mainly the color that marks the difference. The Vespa 150 is no longer finished in a beautiful metallic paint, but now comes in a dove blue solid paint (MaxMeyer Code 1.298.7213).
Frame numbers by year:
1962: VBB2T 146001-155712
1963: VBB2T 155713-198232
1964: VBB2T 198233-240757
1965: VBB2T 240758-273260
1966: VBB2T 273261-279948
1967: VBB2T 279949-280148