I found this Scott US #634 with what appears to be orange ink in top right corner. Ink appears to be present and of a different color rather than just being thin; however, I might just be unfamiliar with common print/ink issues
This was one of the thousand A157s I'm sorting through, so variants have become quite interesting to me. I haven't come across anything but used 11 x 10 1/2 yet. Opinions welcomed. Thanks!