| Manufacturer: |
E. Howard Watch Co. (Keystone) |
 |
| Manufacturer Location: |
Waltham, Massachusetts |
|
| Movement Serial Number: |
1286038 |
|
| Grade: |
Series 0 |
|
| Variation: |
Hooked Bridge Jeweled Banking Pins |
|
| Model: |
1907 |
|
| Estimated Production Year: |
1915 |
|
| Run Quantity: |
200 |
|
| Grade/Model Run: |
27 of 29 |
|
| Grade/Model Total Production: |
16,500 |
|
| Variant Est. Production: |
700 (16S-M1907-23J-HNL-A5PTI-HOOKED BRIDGE JEWELED BANKING PINS) |
|
| Size: |
16s |
|
| Jewels: |
23j |
|
| Jewel Material: |
Ruby & Sapphire |
|
| Movement Configuration: |
Hunting |
|
| Movement Finish: |
Nickel |
|
| Movement Setting: |
Lever or Pendant |
|
| Plate: |
Bridge Plate |
|
| Bridge Type: |
Center |
|
| Double Roller: |
Yes |
|
| Barrel: |
Going |
|
| Regulator: |
Reed |
|
| Hairspring: |
Breguet |
|
| Standard Dial Type: |
Double-Sunk |
|
| Adjusted: |
Yes |
|
| Adjusted to Position: |
Yes |
|
| Adjusted # of Positions: |
5 |
|
| Adjusted to Temperature: |
Yes |
|
| Adjusted to Isochronism: |
Yes |
|
| Railroad Grade: |
No |
|
| Dial Feet Locations: |
10.7, 24.3, 48.9 |
|
| U.S. Patents: |
796162, 886387, 900183, 978612, 981667, 1062645 |
|
| Case: |
Various |
