I have in my collection a mint pair of the 1866 S.G.7. showing 'OWA' of papermakers watermark also a block of four where the top right hand stamp shows 'NS' of the watermark. I also have a single showing a watermark of a different type in a script form as opposed to the lettering which is in clear and unmistakable block capitals. Presumably the name is 'COWAN & SONS.' Can any member definitely confirm this?
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