1973
Pressing Plant ID (Stamped in runouts): MR (In a circle)
Matrix / Runout (Label side A): PE-5603-A
Matrix / Runout (Label side B): PE-5603-B
Matrix / Runout (Runout side A): PE-5603-A-1C MR (In a circle) Δ18091(2) STERLING
Matrix / Runout (Runout side B): PE-5603-B-1C MR (In a circle) Δ18091-X(1) STERLING
1973
Pressing Plant ID (Stamped in runouts): MR (In a circle)
Matrix / Runout (Label side A): PE-5603-A
Matrix / Runout (Label side B): PE-5603-B
Matrix / Runout (Runout side A): PE-5603-A-1C MR (In a circle) Δ18091(2) STERLING
Matrix / Runout (Runout side B): PE-5603-B-1C MR (In a circle) Δ18091-X(1) STERLING