Their first album was only pressed in mono at the time of release in late 1969. The sleeve is printed on thick card and has a gloss finish, with the word 'mono' in the top-right corner of the front. Original discs are thick, with textured 'deep groove' labels. Copies that say 'stereo' on the labels are routinely sold as originals, but are in fact reissues from the late 70s, and play mono. These discs are flimsy, with glossy labels and no 'deep groove'. In addition, their sleeves are not glossy, and have the word 'mono' removed from the top corner of the cover. To summarise: any copy of either of their LPs that says 'stereo' is a later 70s reissue, and will play mono.