Does anyone know where I can see this watermark? I have several U6 Envelopes that have some sort of watermark, but I don't know what I am looking for. They are all half slit open at the top and I don't want to open them up. I can clearly see a watermark, but I don't know what I am seeing. I've searched on the internet with no luck!
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Hold the open side of the envelope open and toward a light source. The envelope should be positioned between the light source and the viewer's eyes. This technique works best. Results using a light box can be confusing if watermarks on the front and back of the envelope overlap. Another technique is use an LED flashlight inserted into the envelope. A pictorial listing of the watermarks should be handy to aid in identification. Dandy rolls wore with use and sometimes lost bits and pieces.