For photos and more information, see:
"The Nobel Jerome Patent 30-Hour Brass Weight Movement and Related Movements", by Snowden Taylor, Bulletin of the National Association of Watch and Clock Collectors, Inc., Whole Number 211, Part II, December 1982.
| Movement Type (from Snowden Taylor article mentioned above) | Distinguishing Features |
| 1.243 | Diagonal cut on escape wheel cock (later movements have no cut). Brass hammer with crescent shaped cutout. Deep teeth on count wheel. Wide rim on count wheel and time mainwheel. No name on movement. |
| 1.241, early | Brass hammer with crescent shaped cutout. Deep teeth on count wheel. Wide rim on count wheel and time mainwheel. Count lever has inserted eyelet for trip wire (on later movements the count lever is bent to form an eyelet). |
| 1.241, middle | Medium depth teeth on count wheel. Zinc hammer (early) or round brass hammer. |
| 1.241, later | Shallow teeth on count wheel (only a triangle portion projecting above the rim). Round brass hammer. |
| Transition movement, has pinned plates like 1.241, but plate is shaped like 1.242 (i.e., it has the projection by the time second wheel pivot). | |
| 1.242 | Screws on pillar posts (earlier movements use pins to hold on front plate). Semi-circular projection on plates by time second wheel pivot. |
| 1.8 | Trip wire on tail (earlier movements have trip wire on count lever). Semi-circular projection on plates by time second wheel pivot. |
Movement 1.243: Diagonal cut on escape wheel cock (later movements have no cut). Brass hammer with crescent shaped cutout. Deep teeth on count wheel. Wide rim on count wheel and time mainwheel. No name on movement. Courtesy of Richard C. Tjarks.
1.241, early: Brass hammer with crescent shaped cutout. Deep teeth on count wheel. Wide rim on count wheel and time mainwheel. Count lever has inserted eyelet for trip wire (on later movements the count lever is bent to form an eyelet).