1,039/Smoothed Out Slappy Hours is a collection of early recordings by the American
punk rock band
Green Day. It was released on July 1, 1991, through
Lookout! Records. Often referred to as the band's debut album, the compilation combines the band's actual debut
39/Smooth and its first two
extended plays Slappy and
1,000 Hours, which are all currently
out of print. The album included one cover, "
Knowledge" (originally from the
Slappy EP), which was originally by influential California punk band
Operation Ivy, whose singer,
Jesse Michaels, contributed the artwork for the album. The cover art features the same image from
39/Smooth.