Roughly half of the outer edge of the rim where two sections of the mold meet (the parting line of this disc) is slightly sunken in. Instead of the normal rounded shape of the rim, this goobered section looks like a butt. The indent is less than 1mm. There is also some extra flashing (plastic that seeps out of the mold which would normally be trimmed off leaving a smooth seam) still in the sunken place.