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Help identiying this mark please

I have been going through my family’s old silverware. I’m in the process of learning about silvermarks and trying to identify silver from silverplate.

Can someone help me with this mark please?
IMG_7991.JPG

this is plated. Could be Norwegian but I am not sure of origin.
90 refers to thicknes of plating. Could be 40 - 60 or 90