1000 + 900 + 50 + 20 + 7 = 1977
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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.
Under today's rules now governing the Roman numeral system MCMLXXVII is equivalent to 1977 in Hindu-Arabic numerals
1977 in roman numerals is MCMLXXVII.
1977 = MCMLXXVII 1978 = MCMLXXVIII
1977