As many on here know, there are several non-T206s that have same the pictures as contained in the T206 set. They are: T213, T214, and T215.
There are 3+ types of T213's: Types 1, 2, 3 and Type 3 factory 8 overprint.
There is only one type of T214
There are 3 types of T215: Pirate, and Types 1 and 2.
Pictures of all of these Back-Types and variations (other than T215-2, which is same as -1), are below.
It is widely regarded that none of these are T206s, however, arguments can made made that T213-1 and T215-1 can be considered T206 because they were distributed in 1910. There is zero chance any of the other variations/types can be considered T206 because none of them were distributed between 1909-11, which is when T206s were distributed.
Many people who do back runs try to get all of the non-T206 variations and consider them necessary to a complete back run (see Jamie's Red Cobb run).
As far as rarity, in my experience, T213-1 is on par with Carolina Brights, while T215-1 is more rare and on par with, or even rarer, than Drum (Brown Lenox and Brown Old Mill being by FAR the rarest of all backs). T213-2 are fairly common. T213-3 are rare, but can be found, however, the Fact 8 Overprints are super tough and many are 1 of 1's
Meanwhile, T215 Pirate is wicked tough. These are almost never seen and tougher than T206 Brown Mill, which is the rarest of all T206 backs; I have only seen 4 that were not part of the singular, almost-complete set out there. T214 is crazy rare, and likely on par with a T206 Brown Lenox.
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