The Songs of Leonard Cohen sleeve says 1966, CBS album label 1967.
Advertised on the sleeve are albums by Barbra Streisand, Andy Williams, Blood Sweat & Tears, Tony Bennett, Marmalade, Tim Hardin, Mike Bloomfield, Gun, Johnny Cash, Dr Byrds, Georgie Fame, Johnny Mathis, The Peddlars, The Tremeloes, Love Affair, Bob Dylan (Nashville Skyline)

You've just proved my point, Nashville Skyline was released in March 1969! So how can an album released in 1966 be advertising an album from 3 years in the futue? This must have been printed in early 1969 and purchased sometime after that! The item on the sleeve note could well have been written at an earlier date than the actual album release date which was Dec 27th 1967 in US and sometime later in 1968 in UK.