I just now finally started to check watermarks in my stamps and I'm not getting anything. I've only checked a few Washingtons. Either all the ones I checked are not watermarked or I'm doing something wrong.
I did see this one and let me know if this is a watermark I'm seeing.
It's an imperforate Washington red (letter denomination) either 344 or 384. Is that the watermark in the upper right?