Not sure about that Sammy, and thanks for all the other comments. Clearly it's a beater tool, probably overheated one or more times. The bluish color on the teeth concerns me more than the overall sharpness- if I recall my jr. High School foundry classes, blue temper means hard and brittle, spring temper, likely to chip the teeth edges more easily. But I'm just starting out with my horizontal mill so I'd rather practice with a 30$ cutter than a 130$ one.
Mark S.
thanks also for the tip about Brian Gruschow- Great prices. Might be worth buying a whole bushel of dull cutters for cheap and just do 'em all at once.