| Model Num | Machine S/N Base | Machine S/N First | Machine S/N Last |
|---|---|---|---|
| 627B | 38V | 986 | 1530 |
| Misc: | |||
| 621 | 37G | 1975 | UP |
| Misc: Field replacement | |||
| 621 | 40G | 357 | UP |
| Misc: Field replacement | |||
| 621E, 621F | 6BB | 1 | 1234 |
| Misc: Use with 3G1729 Head | |||
| 621E, 621F | 2TF | 1 | 699 |
| Misc: Use with 3G1729 Head | |||
| 627E, 627F | 6FB | 1 | UP |
| Misc: Use with 3G1729 Head | |||
| 627E, 627F | 6HB | 1 | UP |
| Misc: Use with 3G1729 Head | |||
| 621B | 31V | 1338 | UP |
| Misc: | |||
| 621B | 36V | 1503 | UP |
| Misc: | |||
| 621B | 73V | 820 | UP |
| Misc: | |||
| 621B | 6XB | 1 | UP |
| Misc: | |||
| 621B | 9AC | 1 | UP |
| Misc: | |||
| 621R, 621S | 2TF | 1 | 699 |
| Misc: | |||
| 627B | 37V | 724 | 1059 |
| Misc: | |||