the predecessor Barons were 55, A55, B55, C55, D55, E55.
Not quite megan. Being totally pedantic here, the earlier Barons were 95-55's, 95-A55's, 95-B55's, 95-C55's and 95-D55's. but Beech in 1970 then dropped the "95" prefix and called the next model the E55. Oddly, it seems the 56TC (developed from the 95-C55) never had the prefix either.