Page Notes
During plate layout, compass arcs were etched on the printing plate to help ensure that the rows of stamps would be aligned.
Occasionaly the "Arc" varieties can be found on the finished product.
39UL2
Flaw Zone 9
72LL90
Flaw Zone 2
72LL100
75LL95
Retouch Zone 1
136LR100 Q
Re-entry Zone 20
144UL1
Flaw Zone 8
Unknown
Flaw Zone 6