Pocket Watch Database
Keystone Watch Case Co.
Boss Patent
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 Patent
James Boss was originally granted a patent for his process of manufacturing gold-filled watch cases on May 3, 1859 (U.S. Patent #23820). Reese Peters was the first manufacturer to utilize Boss' patent to create gold-filled cases, guaranteeing the cases for twenty years. At the time, these cases were referred to as "stiffened gold" cases. In 1871, Boss sold the rights to his patent to John Stuckert (Philadelphia). From 1871 to 1875, Stuckert manufactured gold-filled cases using the "J. Boss" name. Following Stuckert's death in 1875, the firm of Hagstoz & Thorpe purchased the factory and the rights to the "J. Boss" name and patented process. According to advertisements published in trade magazines by Hagstoz & Thorpe, the company introduced an improved Boss case in 1879, featuring a thicker layer of gold. A few years later, in 1883, Hagstoz withdrew from the company, and soon after, the company was renamed the Keystone Watch Case Company. Under the management of the Keystone Watch Case Company, the "Boss" cases became the most popular gold-filled cases in the country. Cases manufactured after 1883 will feature the Keystone Watch Case Company logo in addition to the "Crown and Scales" mark (or other marks later introduced to indicate quality).
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Serial No.: | #734499 |
Manufacturer: | Hamilton |
Grade: | 975 |
Size: | 16s |
Model: | 1 |
Jewels: | 17j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1909 |
Case Model: | J Boss |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5325504 |
Added By: | Rickglick1 |
Serial No.: | #385855 |
Manufacturer: | Hamilton |
Grade: | 990 |
Size: | 16s |
Model: | 1 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1907 |
Case Model: | J Boss |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5341974 |
Added By: | fourleaf57 |
Serial No.: | #B247132 |
Manufacturer: | Ball - Waltham |
Grade: | Official Standard |
Size: | 16s |
Model: | 1899 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1910 |
Case Model: | Ball Model |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 20 |
Case Serial: | 5362402 |
Added By: | Joerealtor |
Serial No.: | #B236958 |
Manufacturer: | Ball - Waltham |
Grade: | Official Standard |
Size: | 16s |
Model: | 1899 |
Jewels: | 17j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1909 |
Case Model: | Ball Model/ J Boss |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5407058 |
Added By: | Rickglick1 |
Serial No.: | #1114582 |
Manufacturer: | E. Howard Watch Co. (Keystone) |
Grade: | Series 1 |
Size: | 16s |
Model: | 1907 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1911 |
Case Model: | J Boss EXTRA |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 30 |
Case Serial: | 5435880 |
Added By: | Rickglick1 |
Serial No.: | #1395476 |
Manufacturer: | Hamilton |
Grade: | 992 |
Size: | 16s |
Model: | 2 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1920 |
Case Model: | Boss Scale Crown 14k/25yr |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5442112 |
Added By: | tctimepieces |
Serial No.: | #1358470 |
Manufacturer: | Hamilton |
Grade: | 992 |
Size: | 16s |
Model: | 2 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1919 |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5456529 |
Added By: | cbfixesall |
Serial No.: | #13666267 |
Manufacturer: | Elgin |
Grade: | 336 |
Size: | 18s |
Model: | 5 |
Jewels: | 17j |
Setting: | Pendant |
Finish: | Nickel |
Est. Date: | 1909 |
Case Model: | J. BOSS |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 20 |
Case Serial: | 5536331 |
Added By: | Wizardmaster |
Serial No.: | #10937954 |
Manufacturer: | Waltham |
Grade: | No. 620 |
Size: | 16s |
Model: | 1899 |
Jewels: | 15j |
Setting: | Pendant |
Finish: | Nickel |
Est. Date: | 1901 |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5537222 |
Added By: | Elguapowho |
Serial No.: | #14187028 |
Manufacturer: | Waltham |
Grade: | No. 845 |
Size: | 18s |
Model: | 1892 |
Jewels: | 21j |
Setting: | Lever |
Finish: | Nickel |
Est. Date: | 1904 |
Case Material: | Goldfilled |
Gold Karat: | 14 |
Guarantee: | 25 |
Case Serial: | 5537960 |
Added By: | kansasbeals |