White letters out or in!?

I don't believe white letter tires came out till late 60's. I know in 65 the Formula S had blue line tires. If the year you have didn't come out with them, I would rather not use them. On the flip side, I think white letter tires look great.
1969. If you look at Dodge sales brochures, for example, in '68 they show red line tires and whitewall tires. There are no white letter tires shown in the '68 sales brochures. In '69 a few cars are shown with Goodyear Polyglas white letter tires, but some still have red lines and whitewalls.