Pocket Watch Database

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]
J.Boss
10K
Gold Filled

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

Database ID:PWDB-9
Case Grade:Boss Scale 10K/20YR
Material:Gold-Filled
Gold Content:10K
Guarantee:20-Year
Introduced:January 1898
Note:Keystone added an additional five years to the guarantees starting January 1898, leading to the 10K/20YR grade.
Patents:#23820
Marking Variants:
(Not Intended to be Comprehensive)
Original Papers:

Image Provided by The Keystone



Image Provided by The Keystone


Catalog Sources: 1877DFC 1878CYC 1880GHR 1880JAB 1880NHW 1882SFM 1883GHR 1883UNK 1884LSS 1885OY 1886HMS 1886RA 1887BHIA 1887LAM 1888BA 1888OY 1889BAM 1889EVR 1890AP 1890BA 1890CHK 1890JC05 1890OY 1890SFM 1891RR 1891SAC 1892ACR 1892BAC 1892CPS 1892WES 1893BFNA 1893BHIA 1893MCE 1893SAC 1894BA 1894BATM 1894NRC 1895OY 1895SFM 1896MF 1896OY 1897BB 1898MLMF 1899ACB 1899BHIA 1899SAC 1900BA 1900BHIA 1900LMC 1900NHW 1901BAC 1901OY 1902ACB 1902BATM 1902BB 1902MF 1903ACB 1903BAC 1903FDW 1903N76 1903ON 1904ACB 1904BA 1904LB 1904PWC 1905ACB 1905BAC 1905DH 1905FNCS 1905ON 1906ON 1906SRC 1907ACB 1907JVF 1907NAC 1907NBC 1907OY 1907SFM 1908ACB 1909BAC 1910ACB 1911NG 1911OY 1911WJJ 1912COC 1912HA 1912NG 1912SFM 1912WJJ 1913FDW 1914ELD 1915ACB 1915ON 1915PWE 1916LCM 1917BA 1923CBN 1923ON 1925ASJ 1925CPS 1928ON 1932ON 1942WAG
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8 Admirations
Serial No.: #B252950
Manufacturer:Ball - Waltham
Grade:Official Standard
Size:16s
Model:1899
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1911
Case Model:Victory
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:4467302
Added By:Rickglick1 Profile Image Rickglick1
5 Admirations
Serial No.: #3354391
Manufacturer:Illinois
Grade:706
Size:16s
Model:9
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1918
Case Model:Model 9
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:4720887
Added By:giddykippa Profile Image giddykippa
5 Admirations
Serial No.: #4792738
Manufacturer:Illinois
Grade:Bunn Special
Size:16s
Model:14
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1926
Case Model:JBOSS
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5003591
Added By:Gimparoo Profile Image Gimparoo
2 Admirations
Serial No.: #18078588
Manufacturer:Waltham
Grade:No. 630
Size:16s
Model:1908
Jewels:17j
Setting:Pendant
Finish:Frosted
Est. Date:1910
Case Model:Victory
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5022537
Added By:Dano79 Profile Image Dano79
3 Admirations
Serial No.: #60443
Manufacturer:Non-magnetic Watch Co.
Grade:74
Size:16s
Model:1
Jewels:15j
Setting:Lever
Finish:Gilt
Est. Date:1890
Case Model:Side winder
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5051618
Added By:james9806 Profile Image james9806
3 Admirations
Serial No.: #B230654
Manufacturer:Ball - Waltham
Grade:Official Standard
Size:16s
Model:1899
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1908
Case Model:Ball Model
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5299591
Added By:strikeph Profile Image strikeph
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 Profile Image SethThomasFan
3 Admirations
Serial No.: #4108954
Manufacturer:Illinois
Grade:Bunn Special
Size:16s
Model:11
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1922
Case Model:J. Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5389248
Added By:cranemaker Profile Image cranemaker
7 Admirations
Serial No.: #21234111
Manufacturer:Elgin
Grade:454
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1919
Case Model:Boss Scale 10k/20yr
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5397572
Added By:tctimepieces Profile Image tctimepieces
3 Admirations
Serial No.: #24018866
Manufacturer:Elgin
Grade:303
Size:12s
Model:3
Jewels:7j
Setting:Pendant
Finish:Nickel
Est. Date:1921
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5398721
Added By:Joef21 Profile Image Joef21
3 Admirations
Serial No.: #21847217
Manufacturer:Elgin
Grade:455
Size:16s
Model:15
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1919
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5403116
Added By:boldingm Profile Image boldingm
10 Admirations
Serial No.: #10574660
Manufacturer:Waltham
Grade:Vanguard
Size:18s
Model:1892
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1901
Case Model:J. Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5534010
Added By:Raja72 Profile Image Raja72
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 Profile Image Wizardmaster
22 Admirations
Serial No.: #548926
Manufacturer:Hamilton
Grade:999
Size:18s
Model:1
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1907
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:5538705
Added By:CJEmpire3 Profile Image CJEmpire3
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 Profile Image Elguapowho
2 Admirations
Serial No.: #305309
Manufacturer:Columbus Watch Co.
Grade:Unknown
Size:18s
Model:2
Jewels:15j
Setting:Lever
Finish:Nickel
Est. Date:1894
Case Model:J. Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:6139130
Added By:boldingm Profile Image boldingm
3 Admirations
Serial No.: #8365042
Manufacturer:Waltham
Grade:No. 820
Size:18s
Model:1883
Jewels:15j
Setting:Unknown
Finish:Nickel
Est. Date:1897
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:6287582
Added By:TMelton Profile Image TMelton
2 Admirations
Serial No.: #13918619
Manufacturer:Waltham
Grade:Seaside
Size:0s
Model:1891
Jewels:15j
Setting:Pendant
Finish:Nickel
Est. Date:1904
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:6592390
Added By:rswain Profile Image rswain
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 Profile Image Tahoward82
2 Admirations
Serial No.: #273184
Manufacturer:Hamilton
Grade:941
Size:18s
Model:2
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1904
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:6821798
Added By:strikeph Profile Image strikeph