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I repurposed some manila stock pages to serve as organizers for my stamp mounts. They are to long to fit in the pockets horizontally, so I insert them vertically, and staple the inner package across the page to keep them from flopping.
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This image shows the watermark in white, and is almost as bad as the previous image.
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Attempted different scanning techniques, to bring out the watermark. This image gave a black watermark that was not much help.
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Finally, scanned through a brown glass filter and with the image processed by RetroReveal, it is clear to see that this is c.
