Last track is a deejay medley cut by Big Youth and not a dub.
Release year is uncertain. The catalogue # would place it at latest being released in 1972 (since MS8 is a '72 release). Had it been released then this would be to consider the first real dub album ever released. For more information on this check David Katz article In search of the first dub LP. The same article claims it was mixed by Carlton Lee at Dynamics.
