Question about a mark on some flatware

I have several pieces of flatware that say “CJS” “PRIMA” and have a mark. I am assuming they are silverplate, but I am not familiar with the maker, nor have I been able to find any information googling, and I don’t know the mark. Does anyone know who this maker is and if this item is silverplate?
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It is silver plate dont know maker, but it is Danish.
D hammer A means Dansk Arbejde - Danish Work - quality mark used from 1908 onwards. The organisation Landsforeningen dansk arbejde - translate The national association for danish interprice.