There are several caption flaws in the t206 set a few are cataloged but most are not.
I have been keeping track of the ones I know of for several years and one of them is this Ames flaw I found.
It has a flaw in the A in NAT"L
Ames Print defect - Copy.jpg
Of all the caption flaws I have been tracking this one has the least examples that I've found with 6 different examples 5 Piedmont 150's and 1 Sweet Caporal 150 factory 25.
Here are scans of the 6 I know of one of them was soaked and re-graded (3A and 3B)
PD150-1.jpg
PD150-2.jpg
3A
PD150-3A.jpg
3B
PD150-3B.jpg
PD150-4.jpg
PD150-5.jpg
SC150-25-1.jpg
If anyone has or knows of a different one and wants to post it here I will add it to the list.