From RROCA-info
Approximate number produced: 106, including the 3 Royce cars
| Chassis Series | Year | Comments |
| Royce cars | 1904 | 2 cyl. |
| 20150-20163 | 1904/5 | 2 cyl. 10 hp. |
| 20165-20167 | 1904/5 | 2 cyl. 10 hp. |
| 23924 | 1905 | 3 cyl. 15 hp. |
| 23926 | 1905 | 4 cyl. 20 hp. |
| 23927 | 1905 | 6 cyl. 30 hp. Scrapped |
| 24263/4 | 1905 | 4 cyl. 20 hp. |
| 24272/3 | 1905 | 3 cyl. 15 hp. |
| 24274/5 | 1905 | 6 cyl. 30 hp. 3 pairs of cylinders |
| 26330/2 | 1905 | 3 cyl. 15 hp. |
| 26350-26354 | 1905/6 | 4 cyl. 20 hp. |
| 26356-26359 | ||
| 26355 | 1905/6 | 6 cyl. 30 hp. 3 pairs of cylinders |
| 26370-26375 | ||
| 40500-40511 | 1906 | 4 cyl. 20 hp. |
| 40519-40533 | ||
| 40518 | 1906 | V8 "legalimit" |
| 60500-60511 | 1906/7 | 6 cyl. 30 hp. 3 pairs of cylinders |
| 60524-60538 | ||
| 80500 | 1905 | V-8 |