Although there would be all sorts of picture sleeves later, it was originally released with a plain paper sleeve, as seen here.
At the time the band line-up was Johnny Rotten on vocals, Steve Jones on guitar, Glen Matlock on bass, and Paul Cook on drums, a line-up many think was their best, myself included.
Although the Pistols had been around since 1975, building a reputation for themselves through live appearances, it's fair to say that nobody was prepared for what happened when they finally committed themselves to vinyl. It's impossible to imagine Punk Rock without the Pistols, although it was probably going to happen anyway. It just would have been different.
The barbarians were at the gate, and nothing would ever be the same again.