Pocket Watch Database

Keystone Watch Case Co. Boss Scale 10K/15YR
Watch Case Marking for Keystone Watch Case Co. Boss Scale 10K/15YR: [Scales]

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/15YR

Database ID:PWDB-37
Case Grade:Boss Scale 10K/15YR
Material:Gold-Filled
Gold Content:10K
Guarantee:15-Year
Introduced:July 1889
Discontinued:January 1898
Note:"Solid Gold Bows and Thumb Pieces" [1895SFM]. The 1895SFM catalog indicates the 6-Size is guranteed to only 10 years. However, this is likely an error since the 10K was guranteed for 15 years during this era.
Patents:#23820
Original Papers:

Image Provided by Jones & Horan


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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2 Admirations
Serial No.: #6387466
Manufacturer:Elgin
Grade:117
Size:6s
Model:2
Jewels:7j
Setting:Pendant
Finish:Gilt
Est. Date:1896
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:20
Case Serial:5002063
Added By:JenZo82 Profile Image JenZo82
10 Admirations
Serial No.: #497161
Manufacturer:Ball - Hamilton
Grade:999g
Size:18s
Model:1A
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1906
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:20
Case Serial:5139474
Added By:CJEmpire3 Profile Image CJEmpire3
6 Admirations
Serial No.: #2118887
Manufacturer:Elgin
Grade:44
Size:18s
Model:5
Jewels:15j or 17j
Setting:Pendant
Finish:Nickel
Est. Date:1887
Case Model:J.Boss
Case Material:Goldfilled
Case Serial:5146873
Added By:machinistrich Profile Image machinistrich
9 Admirations
Serial No.: #408377
Manufacturer:Hamilton
Grade:940
Size:18s
Model:1
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1903
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:20
Case Serial:5324777
Added By:MichaelB Profile Image MichaelB
2 Admirations
Serial No.: #1096377
Manufacturer:Hamilton
Grade:974
Size:16s
Model:2
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1914
Case Model:J.Boss
Case Material:Goldfilled
Guarantee:25
Case Serial:5349590
Added By:OntarioLantern Profile Image OntarioLantern
4 Admirations
Serial No.: #16308935
Manufacturer:Elgin
Grade:372
Size:16s
Model:15
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1912
Case Model:J.Boss
Case Material:Goldfilled
Guarantee:20
Case Serial:5365804
Added By:okiejohn Profile Image okiejohn
4 Admirations
Serial No.: #1205394
Manufacturer:Hampden
Grade:Special Railway
Size:18s
Model:3
Jewels:23j
Setting:Lever
Finish:Two-Tone
Est. Date:1898
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:25
Case Serial:5378654
Added By:redjms Profile Image redjms
5 Admirations
Serial No.: #9860436
Manufacturer:Elgin
Grade:270
Size:16s
Model:9
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1903
Case Model:J.Boss
Case Material:Goldfilled
Guarantee:25
Case Serial:5393505
Added By:MichaelB Profile Image MichaelB
3 Admirations
Serial No.: #2472857
Manufacturer:Illinois
Grade:Bunn Special
Size:18s
Model:6
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1912
Case Model:J.BOSS
Case Material:Goldfilled
Guarantee:25
Case Serial:5421583
Added By:Steve3bs Profile Image Steve3bs
18 Admirations
Serial No.: #831232
Manufacturer:Hamilton
Grade:954
Size:16s
Model:1
Jewels:17j
Setting:Pendant
Finish:Nickel
Est. Date:1911
Case Model:J.Boss
Case Material:Goldfilled
Guarantee:20
Case Serial:5431656
Added By:Mobilaero Profile Image Mobilaero
Serial No.: #920843
Manufacturer:South Bend
Grade:209
Size:16s
Model:2
Jewels:9j
Setting:Pendant
Finish:Nickel
Est. Date:1919
Case Model:J.BOSS
Case Material:Goldfilled
Guarantee:25
Case Serial:5527684
Added By:Steve3bs Profile Image Steve3bs
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
7 Admirations
Serial No.: #11857028
Manufacturer:Elgin
Grade:333
Size:18s
Model:11
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1905
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:25
Case Serial:5598820
Added By:CJEmpire3 Profile Image CJEmpire3
3 Admirations
Serial No.: #12500451
Manufacturer:Waltham
Grade:Vanguard
Size:18s
Model:1892
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1903
Case Model:J.BOSS
Case Material:Goldfilled
Guarantee:25
Case Serial:5598932
Added By:Steve3bs Profile Image Steve3bs
26 Admirations
Serial No.: #12847334
Manufacturer:Elgin
Grade:189
Size:12s
Model:2
Jewels:19j
Setting:Pendant
Finish:Nickel
Est. Date:1907
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:20
Case Serial:6007211
Added By:MichaelB Profile Image MichaelB
2 Admirations
Serial No.: #8376977
Manufacturer:Elgin
Grade:216
Size:6s
Model:2
Jewels:15j
Setting:Pendant
Finish:Nickel
Est. Date:1900
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:25
Case Serial:6153041
Added By:todix144 Profile Image todix144
10 Admirations
Serial No.: #7000696
Manufacturer:Waltham
Grade:Riverside Maximus
Size:16s
Model:1888
Jewels:21j
Setting:Pendant
Finish:Nickel
Est. Date:October 1896 - June 1902
Case Model:J.BOSS
Case Material:Goldfilled
Guarantee:20
Case Serial:6180288
Added By:darkmaruti Profile Image darkmaruti
3 Admirations
Serial No.: #8396709
Manufacturer:Elgin
Grade:219
Size:0s
Model:1
Jewels:7j
Setting:Pendant
Finish:Gilt
Est. Date:1900
Case Model:J.Boss
Case Material:Goldfilled
Guarantee:20
Case Serial:6387060
Added By:Timing Profile Image Timing
4 Admirations
Serial No.: #9698392
Manufacturer:Waltham
Grade:No. 620
Size:16s
Model:1899
Jewels:15j
Setting:Pendant
Finish:Nickel
Est. Date:1900
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:20
Case Serial:6569685
Added By:todix144 Profile Image todix144
9 Admirations
Serial No.: #118892
Manufacturer:Ball - Hamilton
Grade:999b
Size:18s
Model:1
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1901
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:14
Guarantee:25
Case Serial:6580976
Added By:CJEmpire3 Profile Image CJEmpire3