This CVINYL.COM Label Guide is currently JUST A DRAFT
first Sun Label (1956 - 1960)
Original 1950s copies should have a deep groove.
first Sun Label (1960s)
Most Sun albums were reprinted multiple times with the same label design, but the deep groove is no longer present.
second Sun Label (late 1960s - )
The Sun International Corp. (Shelby Singleton) reissue label, used from the late 1960s on.