I don't know. I've never seen a Roman numeral with more than one lesser numeral preceding a greater numeral, as in "...CCM...".
If you remove one of the C's, MCMLXXVII is 1977.
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It is not a valid Roman numeral
Sorry there is no 'R' in roman numeral
The Roman numeral of C is equivalent to 100
The Roman numeral L represents the number 50
The Roman numeral V represents the number 5.