From Bruce Buck:
"Skeet 1 is roughly equivalent to today’s standard skeet choke. In a 12 gauge gun it is often .005″ constriction. It’s supposed to deliver the optimal pattern of #9s at 21 yards. Skeet 2 is about equivalent to today’s Light Modified 12 gauge choke and often has a constriction of .015″. That’s in between Improved Cylinder and Modified as they are measured in the US."
