| Allen, R.C. | |||||
| R.C. Allen, Business Machines Inc., New York, U.S.A. | |||||
| Models and s/n | Y | M | D | Remarks | Ref. |
| Model 600 | |||||
| up to 1120000 | 1950 | 15 | |||
| 1145000 | 1951 | 15 | |||
| 1166000 | 1952 | 15 | |||
| 1176000 | 1953 | 15 | |||
| Model 700 | |||||
| up to 1750000 | 1952 | 15 | |||
| 1768000 | 1953 | 15 | |||
| 1820000 | 1954 | 15 | |||
| 1850000 | 1955 | 15 | |||
| 2100000 | 1956 | 15 | |||
| 2139000 | 1957 | 15 | |||
| Model 800 | |||||
| 1920000 | 1957 | 6 | |||
| 1980000 to 2029999 | 1958 | 6 | |||
| Model 'A' Visiomatic | |||||
| 2030000 | 1959 | 6 | |||
| 2100000 | 1960 | 6 | |||
| 2200000 | 1962 | 6 | |||
| 2300300 | 1963 | 6 | |||
| 2330800 | 1964 | 6 | |||
| 2350400 to 2358399 | 1965 | 6 | |||
| Model 'B' Visiomatic | |||||
| 2358400 | 1966 | 6 | |||
| 2367200 up | 1967 | 6 |