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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Information provided by users may contain inaccuracies. Dials, cases, and hands displayed may not be original to the watch.

2 Admirations
Serial No.: #5305427
Manufacturer:Illinois
Grade:Bunn Special
Size:16s
Model:14
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1930
Case Model:206
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Added By:Tiknawy Profile Image Tiknawy
2 Admirations
Serial No.: #27202203
Manufacturer:Elgin
Grade:478
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1925
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Added By:wmike565 Profile Image wmike565
6 Admirations
Serial No.: #10859914
Manufacturer:Elgin
Grade:214
Size:18s
Model:8
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1904
Case Model:Open face
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Added By:Sergeant Profile Image Sergeant
6 Admirations
Serial No.: #I279372
Manufacturer:Elgin
Grade:571
Size:16s
Model:20
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1954
Case Model:3055 Streamline
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:K04210B
Added By:NickYorks Profile Image NickYorks
2 Admirations
Serial No.: #B204230
Manufacturer:Ball - Waltham
Grade:Official Standard
Size:16s
Model:1899
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1904
Case Model:5111091
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:B204230
Added By:Lms0033 Profile Image Lms0033
0 Admirations
Serial No.: #B213523
Manufacturer:Ball - Waltham
Grade:Commercial Standard
Size:16s
Model:1899
Jewels:16j or 17j
Setting:Pendant
Finish:Nickel
Est. Date:1905
Case Model:J. BOSS
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9B26974
Added By:Wizardmaster Profile Image Wizardmaster
2 Admirations
Serial No.: #1321614
Manufacturer:Hamilton
Grade:992
Size:16s
Model:2
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1919
Case Model:9688-20
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9688-20
Added By:082962 Profile Image 082962
3 Admirations
Serial No.: #39388327
Manufacturer:Elgin
Grade:486
Size:16s
Model:13
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1941
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:18289
Added By:geniused Profile Image geniused
3 Admirations
Serial No.: #16028746
Manufacturer:Waltham
Grade:Vanguard
Size:16s
Model:1899
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1907
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:41057
Added By:Rickglick1 Profile Image Rickglick1
4 Admirations
Serial No.: #2576778
Manufacturer:Hamilton
Grade:992
Size:16s
Model:2
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1930
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:53922
Added By:rjandladyj Profile Image rjandladyj
5 Admirations
Serial No.: #5497080
Manufacturer:Illinois
Grade:161a
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1932
Case Model:J Boss Bunn Special #107
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:85551
Added By:Rickglick1 Profile Image Rickglick1
7 Admirations
Serial No.: #34574527
Manufacturer:Elgin
Grade:506
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1934
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:89607
Added By:ultimatekaiser Profile Image ultimatekaiser
3 Admirations
Serial No.: #N18342
Manufacturer:Elgin
Grade:571
Size:16s
Model:20
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1951
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:94524
Added By:TWW369 Profile Image TWW369
4 Admirations
Serial No.: #2750824
Manufacturer:Hampden
Grade:North American Railway
Size:18s
Model:3
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1910
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:115320
Added By:Antiphon Profile Image Antiphon
3 Admirations
Serial No.: #3641394
Manufacturer:Waltham
Grade:No. 15
Size:18s
Model:1883
Jewels:15j
Setting:Lever
Finish:Nickel
Est. Date:August 1888 - October 1888
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:306967
Added By:DWayne22 Profile Image DWayne22
5 Admirations
Serial No.: #9585
Manufacturer:Peoria Watch Co.
Grade:
Size:18s
Model:
Jewels:15j
Setting:Lever
Finish:Gilt
Est. Date:1885-1895
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:1816231
Added By:dcooper Profile Image dcooper
3 Admirations
Serial No.: #5973501
Manufacturer:Waltham
Grade:No. 62
Size:0s
Model:1891
Jewels:11j
Setting:Pendant
Finish:Gilt
Est. Date:June 1893 - November 1893
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:2459553
Added By:Rickglick1 Profile Image Rickglick1
3 Admirations
Serial No.: #6132545
Manufacturer:Waltham
Grade:No. 20
Size:16s
Model:1888
Jewels:7j
Setting:Pendant
Finish:Gilt
Est. Date:September 1893 - November 1893
Case Model:Boss Scale 10k/20yr
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:2797880
Added By:tctimepieces Profile Image tctimepieces
6 Admirations
Serial No.: #1741584
Manufacturer:Hamilton
Grade:992
Size:16s
Model:2
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1923
Case Model:Mainliner
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:4327332
Added By:Rickglick1 Profile Image Rickglick1
3 Admirations
Serial No.: #779057
Manufacturer:Hamilton
Grade:974
Size:16s
Model:1
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1910
Case Model:Victory
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:4414528
Added By:Rickglick1 Profile Image Rickglick1