The first and only 'official' (i.e. band-sanctioned) release on WWA. Other albums on WWA were rereleases of earlier Vertigo LPs and cheap 'cash-in' compilations - Attention Black Sabbath Vol and 2.
1st press features the WWA005 matrix and letters on label etc. However, there is another version which also features the letters and matrix ACB00166....rumours persist of it being printed by another plant at the same time as the aforementioned WWA005 (to meet demand for sales...possible?). Another theory is that it is a record club release, hence the alternative code (this theory seems more likely to me).
Subsequently reissued on NEMS (yet again!)