| Ambassador | A-15 | .485/.500 | 7.5 | | |  |
| Ambassador | A-20 | .510/.525 | 8.5 | F | Student Bass |  |
| Standard/ Self Balancing/ Military | LM-7 | .495/.510 | 7 | | |  |
| Standard/ Self-Balancing/ Military | LM7.5 | .495/.510 | 7.5 | | |  |
| Standard/ Self-Balancing/ Military | L8 | .510/.525 | 8 | | F attachment available. |  |
| Special | L15 | | | | Dual bore, chrome-plated nickel-silver inner slide tubes, may be fluted. |  |
| Self-Balancing/ Self Balancing/ Military | M7 | .485/.500 | 7 | | Tuning in slide |
| Opera | O15 | .547 | 8.5 | | Symphonic bore instrument. Nickel-silver thin-gauge bell. |  |
| Valve | O-20 | .500 | 7.5 | | |  |
| Marching | O-21 | .500 | | | |
| Opera | O23 | .547 | 8.5 | F | Symphonic bore instrument. Nickel-silver thin-gauge bell. |
| Symphony | O-25 | .554 | 8.5 | F | Red brass bell. |
| Opera Fanfare | O115 | .547 | 8.5 | | Symphonic bore instrument. Yellow brass bell. |
| Custom | P-15 | .500 | 8 | | |
| Custom | P-16 | .500 | 7.5 | | |
| George Roberts | P-22 | .565 | 9 | F | Bass .585 F attachment |
| Custom | P24 | .565 | 9 | F | .585 F attachment. |
| George Roberts Bass | P-24G | .565 | 9 | F, G | .585 Independent valves |  |
| Radio | R7 | .510/.525 | 7.5 | Compact. | |
| Radio | R7.5 | .510/.525 | 7.5 | Compact | |
| Recording | R15 | .495/.510 | 7.5 | | |
| Recording | R-20 | .495/.510 | 8.5 | F | Red brass bell. |  |
| Military | S6 | .485 | 6 | | |
| Military | S6.5 | .485 | 6.5 | | |
| Super | S15 | .485/.500 | 7.5 | | |  |
| Super FW | SF15 | .485/.500 | 7 | | | |
| Super | S20 | .547(?) | 9 | F | Bass trombone with flat-wrap F attachment. Tuning in slide. |  |
| Super George Roberts Bass | S-22 | .565 | 9 | F | Tuning in slide |
| Super | S23 | | 9/10 | F/E | Bass trombone with F attachment,dependent E valve. 9 or 10 inch bell. Tuning in slide. |
| Bass | S-24G | .565 | 9 | F, G | |
| Studio | T15 | .485/.500 | 7.5 | | |  |
| Superstar | V-20 | .495/.510 | 8.5 | F | Silver plated. |  |
| Superstar | V-25 | .565 | 10 | F, E | Silver plated. |
