I was just double checking a few sections and reviewing my needs in my self made/printed album pages and noticed something. I based my album pages in part on the 2007 Scott's catalog on disk. I was using my 2020 print addition to do the checks and look at my needs list.
I don't have any R123-R126 stamps at this time. But the illustration in Scott's has CHANGED since 2007! Checked 2014 and it's the same as 2020. From eBay
ads it looks like R123-125 are the stamp depicted in 2007 (Ill. as R13c) but R126 is apparently the one depicted in 2014 & 2020 (Ill. as R13c).
I'm a bit confused as to A: Why the change was made and B: how the difference in design between R123-125 and R126 was missed by Scott's, apparently since 1871. There is no notation indicating multiple designs like they do in other instances.
As these stamps are different sizes and I include a small illustration and SC# within the mounting frame, I guess I'll be reprinting that album page!
I think Scott's needs an illustration R13Ca and R13Cb