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Keystone Watch Case Co.
Keystone Watch Case Co.
Boss Scale 10K/20YR
Keystone Watch Case Co. Boss Scale 10K/20YR
![Watch Case Marking for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]
Guaranteed
J.Boss
20 Years](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Boss-20Years.jpg)
Note: Case manufacturers modified markings over time. As a result, the image above is simply a representation of one particular marking used by the company. Your case marking may differ based on the production era and other parameters.
Boss Scale 10K/20YR
Find Boss Scale 10K/20YR Cases For Sale on eBay See What Other Boss Scale 10K/20YR Cases Have Sold For on eBay![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Case
Guaranteed
J.Boss
20 Years
[Keystone Block]](https://pocketwatchdatabase.com/assets/images/cases/Boss-20Years.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]
U.S.A.](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Scales-USA.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]
J.Boss
10K
Gold Filled](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Boss-10K.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Scales-2.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]
J.Boss
20 Years](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Boss-20Years-2.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]
Guaranteed
J.Boss
20 Years](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Boss-10K-20Years.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Guaranteed
J.Boss
20 Years
[Keystone Block]](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Boss-20Years-3.jpg)
![Watch Case Marking Variant for Keystone Watch Case Co. Boss Scale 10K/20YR: Keystone
Watch Case Co.
[Keystone Block]
[Scales]](https://pocketwatchdatabase.com/assets/images/cases/Keystone-Scales-10K-3.jpg)
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4 Admirations
| Serial No.: | #3504001 |
| Manufacturer: | Seth Thomas |
| Grade: | 28 |
| Size: | 12s |
| Model: | 23 |
| Jewels: | 17j |
| Setting: | Pendant |
| Finish: | Nickel |
| Est. Date: | 1912 |
| Case Model: | Victory |
| Case Material: | Goldfilled |
| Gold Karat: | 10 |
| Guarantee: | 20 |
| Case Serial: | 5318571 |
| Added By: |  SethThomasFan |
3 Admirations
| Serial No.: | #292371 |
| Manufacturer: | Hampden |
| Grade: | Springfield |
| Size: | 18s |
| Model: | 2 |
| Jewels: | 7j |
| Setting: | Lever |
| Finish: | Gilt |
| Est. Date: | 1883 |
| Case Model: | JBOSS |
| Case Material: | Goldfilled |
| Gold Karat: | 10 |
| Guarantee: | 20 |
| Case Serial: | 5536331 |
| Added By: |  Wizardmaster |
2 Admirations
| Serial No.: | #303767 |
| Manufacturer: | Illinois |
| Grade: | 61 |
| Size: | 18s |
| Model: | 2 |
| Jewels: | 15j |
| Setting: | Lever |
| Finish: | Nickel |
| Est. Date: | March 1889 - December 1889 |
| Case Material: | Goldfilled |
| Gold Karat: | 10 |
| Guarantee: | 20 |
| Case Serial: | 6098750 |
| Added By: |  Elguapowho |
2 Admirations
| Serial No.: | #9006846 |
| Manufacturer: | Elgin |
| Grade: | 210 |
| Size: | 16s |
| Model: | 6 |
| Jewels: | 7j |
| Setting: | Pendant |
| Finish: | Nickel |
| Est. Date: | 1901 |
| Case Model: | J.Boss |
| Case Material: | Goldfilled |
| Gold Karat: | 10 |
| Guarantee: | 20 |
| Case Serial: | 6674144 |
| Added By: |  Tahoward82 |
2 Admirations
| Serial No.: | #6498628 |
| Manufacturer: | Waltham |
| Grade: | Am.W.Co. |
| Size: | 0s |
| Model: | 1891 |
| Jewels: | 11j |
| Setting: | Pendant |
| Finish: | Gilt |
| Est. Date: | October 1894 - April 1895 |
| Case Model: | J Boss |
| Case Material: | Goldfilled |
| Gold Karat: | 10 |
| Guarantee: | 20 |
| Case Serial: | 7671430 |
| Added By: |  shaunleatham |
