With this coin, the only lettering I can recognize as being there is "NUM" of "UNUM" Perhaps a star or two. I can't see a year let alone a mint mark. No matter how many photos I took, or with various cameras, the bit of "UNUM" I could see wouldn't show up. The photo taken below is where "NUM" can be seen. Is this considered a valuable misprint or just another grease in the die issue?