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]
Guaranteed
J.Boss
20 Years

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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0 Admirations
Serial No.: #27501703
Manufacturer:Elgin
Grade:472
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1925
Case Model:B W Raymond
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9653036
Added By:tbull537 Profile Image tbull537
3 Admirations
Serial No.: #20142202
Manufacturer:Waltham
Grade:Crescent St.
Size:16s
Model:1908
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1915
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9722861
Added By:strikeph Profile Image strikeph
4 Admirations
Serial No.: #B634205
Manufacturer:Ball - Hamilton
Grade:999p
Size:16s
Model:1
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1929
Case Model:JBoss Ball ORRS
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9723660
Added By:Gimparoo Profile Image Gimparoo
5 Admirations
Serial No.: #3074264
Manufacturer:Illinois
Grade:Bunn Special
Size:16s
Model:9
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1917
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9817395
Added By:Kman1105 Profile Image Kman1105
6 Admirations
Serial No.: #5334515
Manufacturer:Illinois
Grade:163 Bunn Special
Size:16s
Model:14
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1930
Case Model:Bunn Special
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9820075
Added By:cliffdobbins Profile Image cliffdobbins
5 Admirations
Serial No.: #14023205
Manufacturer:Waltham
Grade:Vanguard
Size:16s
Model:1899
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1904
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9836075
Added By:ultimatekaiser Profile Image ultimatekaiser
13 Admirations
Serial No.: #1B8622
Manufacturer:Ball - Hamilton
Grade:999b
Size:16s
Model:5
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1948
Case Model:J Boss RR standard
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9898723
Added By:ultimatekaiser Profile Image ultimatekaiser