Other than the smooth finish, are there any points of reference to compare? To double and triple check ?
Easy. Look to see if it has SMS on the slab label. The story has been posted on CT numerous times , so Search the archives or google it. All the 64SMS were found in the estate of a former mint director. The coins were purchased by a well known dealer in the 90s and all were slabbed. They weren't released into circulation. Those are the details the you tube click bait videos conveniently forget to mention. Hope this helps