May be some informations for you to understand more about scruteneer logos at le mans ;
1/on years 50's there where only some rondos on some cars
2/the real scrutineering stickers (sticked outside the car speaking) started in 1973 and each years until now they changed colors and printing , on those the group ( say category ) of the car where printed
So to my knowledge ( 50 years of le mans work ....) in 66 there where no outside stickers ?????
May be inside of the car some little label was sticked but am not sure ( today being Chritsmas day am not able to check this on my archives !!!!Family first ! LOL)
Hope this helps