Up to 1960, the main decal mentioned “Fender Stratocaster with synchronized tremolo” or simply “Fender Stratocaster” on non-tremelo models. After 1960, various patent numbers were added. These numbers are a safe criterion to assess the originality of the headstock. The 1965-1976 shows the following patent changes (NB the years mentioned have some overlaps, so 1969 can be seen in early 1970):
1965 – 5 patent numbers 2,573,254 / 2,741,146 / 2,960,900 / 3,143,028 / 2,817,261
1966/67 – 3 patent numbers 2,741,146 / 3,143,028 DES 196,062
1968/69 – 2 patent numbers 2,741,146 / 3,143,028 (these appeared with CBS black logo)
1970/71 – 1 patent number 2,741,146
1972/76 – 1 patent number 3,143,028 (in 1976 the patent numbers disappeared when serial numbers first were diplayed on the headstock)