well these were found a good time apart from each other, not like a flood of them, so in rarity terms still rare, whenever i go about looking at early milled i check the collections on colin cooke. and do my research. some coins are not even listed there yet exist, Peck missed a fair few as well. I used that to make up my mind so to me, they are missing N given my knowledge, and research, and given the notes in the Nicholson collection, it was debated then, and is now, and I have the same approach as you, level headed. whats odd is nobody spotted the missing letter and corrected it in the first place.