I don't know the meaning of the marks, if in fact that "V" is a deliberate mark and not accidental.
I am not sure how much trust can be put in the Colt records (I presume you have a Colt letter, sales slip or some other evidence for the March date). Among other things they always don't indicate if a gun was returned to the factory for some reason, when an updated part would have been installed. Clawson says the 1913 date was added between c. C6800 and c. C7800, so your serial number might be a clue.
Jim
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