Paint experts: What color is this?

It looks like FY1 to me.

Some 1971 paint charts that show it at The 1970 Hamtramck Registry - 1971 Paint Chip Charts

it did not make all the '71 paint chip charts as seen above because it was originally not carried over from '70. But they canceled B7 blue early in the '71 model year & brought Y1 back in its place.