It was made in 1967 and it's either a model 110ML or it's someone that bought the receiver and had some work done to it. Reason being is that they never offered that gun in 284. They did offer it in 264 that year, sure your reading it right?
Does it have a cheek piece on the left hand side of the stock as well? The 110PL had a roll over cheek piece but it would have a rosewood gripcap and rosewood foreend tip as well, does it have that?
24 hour sarcastic S.O.B.