There are at least four pressings with violet/purple sleeve design:
1. First pressing came out with thick cardboard foldout cover with only one opening for the disc (front fold is factory glued) and two slightly different pink/black labels variants (they have different layout when comes to the sides markings). One variant comes with tiny "strana A" and "strana B" sides markings on the left side of the labels, while other variant comes with quite remarkable ''a'' or ''b'' sides markings on the right side of the labels. Identical otherwise.
2. Thin fragile unipack middle inserted foldout cover; pink/black labels (only variant with remarkable "a" and "b" sides markings on the right side of the labels spotted). Presumably 2nd print from '73. - there's no evidence of Jugoton releases with unipack style covers prior to '73.
3. Unipack style cover identical to the one mentioned above, black/silver labels (presumably 3rd print - anywhere from late '74. to early '77. - black/silver Jugoton labels have that period layout - without rim text as it was used for '70. to early '74. Jugoton releases).
4. Thicker foldout cover (not as thick as the first pressing though, purple/violet colors are brighter, front opening on both folds and tiny GIP Beograd (cover manufacturer) logo on the low right side of the back of the cover, near spine), pale blue labels with dark blue vertical line (presumably 4th print somewhere from '78. to very early 80's).
All later prints during the 80's appear to have flimsy, fragile unipack middle inserted covers with brownish or almost orange color design. Apparently all of them come with blue labels with slightly different design (all have tressed or not tressed dark blue vertical line). Mid to late 80's dark blue or black label pressings could also be in existence.