Color misregistration. When minor, it is usually considered a poor quality stamp. Usually when the misregistration is a few millimeters, then it is of interest to EFO collectors and starts commanding a minor premium. But it's a pretty fuzzy line between poor registration and a premium EFO. Sometimes the misregistration doesn't have to be a few millimeters (e.g., two-tailed cat, four-eyes) -- it's just a matter of how you market the stamp to catch someones attention/interest.
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