Looking in Guy Fay's Farmall Letter Series Tractors
and IH Tractor Data Book
, I see that your tractor, numbered 311879, is a 1951 model. The V stamped on the sn plate indicates it is a high clear tractor. I'm not sure about the number of high clearance tractors made, but the Super A shows to have been made from 1947 to 1954. Maybe high clearance tractors were available during the entire run. The total number of Super As produced was 94,001, with 27,562 being made in 1951. These numbers also include AVs and International As.