The defining characteristics of a first issue Led Zeppelin IV LP include:
- Atlantic Recording Corporation labels with green/orange color-bands on both sides
- "MASTERED BY CAPITOL" stamped in the dead wax on both sides
- A pressing plant code of "A1" or "A2" in the dead wax on side 2
- "ST-A-6815358/ST-A-6815359" matrix numbers
- A Monarch pressing plant indicator "Monarch" stamped in the dead wax on side 1
RCA Music Service editions of Led Zeppelin IV typically feature a different label design with a red RCA logo, and they may not have the same mastering or pressing plant indicators as the first issue.