| Manufacturer: | E. Howard Watch Co. (Keystone) | |
| Manufacturer Location: | Waltham, Massachusetts | |
| Movement Serial Number: | 36412 | |
| Grade: | Series 12 | |
| Model: | 1921 | |
| Estimated Production Year: | 1924 | |
| Run Quantity: | 26,000 | |
| Grade/Model Run: | 1 of 5 | |
| Grade/Model Total Production: | 47,450 | |
| Size: | 10s | |
| Jewels: | 17j | |
| Movement Configuration: | Openface | |
| Movement Finish: | Nickel | |
| Finish Pattern: | Standard Stripe | |
| Movement Setting: | Pendant | |
| Plate: | Bridge Plate | |
| Regulator: | Plain | |
| Hairspring: | Breguet | |
| Adjusted: | Yes | |
| Adjusted to Position: | Yes | |
| Adjusted # of Positions: | 3 | |
| Adjusted to Temperature: | Yes | |
| Adjusted to Isochronism: | Yes | |
| Railroad Grade: | No | |
| Movement Markings: | E. Howard Watch Co. Boston, U.S.A. [Empty Circle in Arrow] Pat'd. '21 [Some Additionally Marked "17J"] | |
| Case: | Various | |
| Run ID: | 8.G1.10S7.101921M7.O8.P8.17J1 | |
| Database Version: | v52.932 |