 The final Spin single release, one of only two in Festaival's new "K" series (1973–74), was the Bee Gees' "Mr Natural".Spin's EP and LP releases were similarly catalogued; Festival catalogued all EPs in its consecutive '11000' series, prefixed with a two-letter ID prefix (Spin's was "EX").Spin LPs were initially catalogued in Festival's '30000' series and identified with an "EL" prefix".