A-C produced the Roto Baler from 1947-1964, with three special production runs in 1972, 1973 and 1974. These are known as late-model white top balers and had special shielding. Below are the serial number ranges of the late production models for reference.
(data from Norm Swinford's ACFE)
| 1972 | SN 74902-75700 |
| 1973 | SN 75701-76500 |
| 1974 | SN 76501-77300 |
| Click here for photo of SN location |