That's an 89PL! Very nice coin, they are tough to photograph. I have one too: View attachment 1341116 View attachment 1341117 View attachment 1341118 View attachment 1341119
My 1989 business strike is spotty and ugly, but yours are great. All I can contribute is this actual proof for comparison, and because I really like to share this photograph. It’s a marvel to me that a surface can be mirror-like and show a corrugated underlayer all at the same time.
As I've said for decades, quality MS memorial cents are much harder than everyone thinks. Attrition is waying heavy on the series and quality coins will continue to get harder and harder to find.