| Model Num | Machine S/N Base | Machine S/N First |
|---|---|---|
| D50 (SERIES 16) | D50F-16 | 66946 |
| D50 (SERIES 16) | D50S-16 | 65001 |
| D53 (SERIES 16) | D53A-16 | 65001 |
| D53 (SERIES 16) | D53A-16A | 65001 |
| D53 (SERIES 16) | D53A-16B | 65001 |
| D53 (SERIES 16) | D53P-16 | 65001 |
| D53 (SERIES 16) | D53S-16 | 65001 |
| D50 (SERIES 16) | D50A-16 | 65001 |