It is normal for enamel pins to have minor defects due to the manufacturing process. However, this do not affect their functionality.
Grade B
Faint scratches (visible under close distance/bright lights)
Mild uneven surface finishes (e.g. not uniform to the touch)
Grade C
More visible scratches/multiple scratches
Uneven colour fills/surface finishes (e.g. smooth and rough)
Missing colour fills