Pat has done some amazing work. To out it in some context, for the stamps the sheet size was known, and blocks were and are available. More so in the 30's when the plating work began, plus back then the stamps were relatively inexpensive.
Obviously for T206, the sheet size isn't truly known, and there's no blocks. So to assemble so much of a sheet based on flaws that cross from one card to the next is a rather impressive achievement.
Steve B
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