I like finding record sleeves which reference the vinyl format and this Atlantic 12″ promo cover design fits that bill. Most of the labels feature disco or dance records from around 1980 but the single inside (by Brandy) is from 1999, so it is Atlantic showing off their retro street cred. via some classic hits for a new generation, although how many of them would know the old titles from 20 years before I’m not sure. The back cover has the strap line “Music With Longevity” which supports the retro theme. The sleeve is generic, and has a white circle top right over which the details of the record are printed onto a sticker. I’m not sure when this cover was introduced but probably some time in the mid-1990s?
There are some more 12″ sleeves on the site including another nice Atlantic one on this page.