This one's complicated. I think you're right in that die grease was the culprit, at least in part. There are some nasty hits (
PSD) on the parkway in front of the tunnel, but the half filled NORTH CAROLINA and BLUE RI, and lack of detail in nearby devices suggest grease. Also, the numerals in the date are somewhat misshapen and the rim has an offset at the bottom but, as you said, the rim is in good shape all around. However, the discoloration around the rim on the obverse has me confused... is that abrasion? The two sides seem from different coins, although it may be the lighting. Anyway, that's my over-analysis.