Figure 6. Upper left: A difficult to watermark Washington head stamp, a
10¢ yellow, perf. 12, which might have a double line watermark (Scott #338) or a single
line watermark (Scott #381). This stamp has creases, lots of cancel ink in a confounding
pattern and a tear.
Upper Right: The same stamp in Ronsonol®. Note the translucency of the paper
reveals the ink and cancel. The watermark is not obvious.
Lower Left: The same stamp in clarityTM. The watermark is visible at left
center -- part of an "S" is present.
Lower Right: The same stamp in the Signoscope. The watermark is visible without any
effects of the stamp ink and minimal effects of the cancel.
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