Is collar clash the correct term for the reverse of this 1981 Canadian cent? It starts at the T in cent to the last A in Canada
Would have to be a counter collar clash. First a collar clash far enough off to impress the dentils into the edge of the collar, and then a second clash less far of that allowed the clashmarks on the edge of the collar to impress into the "gutter edge" around the circumference of the die. Because it is that "gutter" that creates the top surface of the rim.