HI! cdnum This type of fault is more common than I would like and devalues many of my better KGVs. It is all about water based ink on the envelope, on the place where the stamp is attached. So when the stamp is soaked off paper the ink transfers onto the back of the stamp. The most common for me is whoever rights the amount of the mailing under where the stamp is attached and it is then a part of the back of the stamp after soaking. A 50% devaluation is how I look at them.
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