The marks on your set are the decorator's logo mostly used on capodimonte (*with small 'c,'") reproductions.
They date your set ca 1970s-1990s.
My research indicates that the retail vintage store value range of your set is $700-800 assuming very good condition but also depending on venue. The higher value would be in a larger city.
A private seller to a dealer can expect 40-60% of retail value.
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