The Lionel Billboard Set No. B310 was only produced in 1966 and 1968. It came with five rare billboards of the period that are bordered in PURPLE. The billboard frames themselves are of the common DARK GREEN color that are normally found with the No. 310.
In the price guides for this piece only the "Like New" value can be used because the value is contingent upon the pieces being still housed in the blister pack that was designed to be held in a dealer’s rack. The packaging must be unopened and the five billboards must be uncut and not separated from each other.