Great question Sean. I am starting to believe that one does not need a blue old mill and it’s not a different back. There are 3 known, two of them discovered in last 12 months. I think we need more before they are a recognizable back/back variation. Otherwise they are just oddities; not scrap bc they were certainly put in packs, but oddities like Scott’s blue sovereign. The blue old mill really confounds me- no clue what it is. But I do not think it’s a “back”, and SGC calling it such does not make it so
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