Where possible I have tried to reference one of the earliest and one of the latest years of production to ensure the features remained constant.
5 series
work-in-progress
| Clipper | Sterling | Silent | Silent-Super | |
| Years (approx.) | 1949-1961** | 1949-1963* | 1949-1957 | 1954-1961 |
| Lower-Stencil-Upper Ribbon Selector | Yes | Yes | Yes | Yes |
| Tension Adjuster | Yes | Yes | Yes | Yes |
| Ribbon Reverse lever | Yes | Yes | Yes | Yes |
| Tab | No | Manual | Manual | Key-set |
| Paper Bail | Yes | Yes | Yes | Yes |
| Paper Finger Rollers | No | No | Yes | Yes |
| Paper Guide | No | Yes | Yes | Yes |
| Paper Support | No | Scissor | Scissor | Scissor |
| ‘1’ key | No | No | No | Yes |
| ‘+/=’ key | No | No | No | Yes |
*Switches to the 5AX line, body style changes
** Switches to the 5A line from 5C, body style changes
