It could anywhere be from Dec '65 (first month of the bigger headstock .. the transition decal was already there in '64) through till '68.
In '68 strats got the 'F' tuners other models had been getting since mid '67. As for when the decal changed to the big black curvy 'CBS' style certainly it was there during 68 but whether it began in '67 is debatable.
So headstock is Dec '65 at the earliest.
Tuners are '68 at the very latest but more likely '66 or '67.
Decal is '68 at the very very latest but much more likely '66 or '67.
There is I believe still some variation in those years how many pat numbers should be on the decal so a clearer shot of the decal would help but the best way would be to take it apart and check markings and component date codes.
Just considering the features and odds I think it's likely either a '66 or '67.
PS. Check the neck stamp first ... if the code starts with a 2 it's a 65 since Fender changed the code for a strat neck from 2 to 13 in '66. (It's unlikely though as a '65 wouldn't be likely to have the 5 pat. numbers)
Last edited: Jan 13, 2021