Is it actually without watermark or just a really poor watermark hard to see? Year of use is near the end of the contract period so a worn dandy roll making a hard to see watermark would not be unusual.
I use my Ott light, inverted and a cardboard cutout if necessary to block extra light from my eyes. Unfortunately impossible to see watermarks although scarce, do exist and actually make the envelope less desirable. Good luck.
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