The Oliver 77 came into production in 1948 and production ran until the supers came out in 1954. The 77 diesel didn&#039;t appear until 1949. There were very few changes from 49-53. Yours may have the hydra electric lift that appeared in 49. There were some changes in the seat confideration. Some of the oliver experts could possibly give you the year by the block cast number. According to published price lists your tractor is worth 990-1780 according to condition.