Pocket Watch Database

Keystone Watch Case Co. Boss Scale 10K/20YR
Watch Case Marking for Keystone Watch Case Co. Boss Scale 10K/20YR: Guaranteed
J.Boss
20 Years
[Keystone Block]

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.

3 Admirations
Serial No.: #5761267
Manufacturer:Waltham
Grade:J
Size:6s
Model:1890
Jewels:7j
Setting:Pendant
Finish:Gilt
Est. Date:January 1893 - December 1894
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:7127543
Added By:jbrookman Profile Image jbrookman
7 Admirations
Serial No.: #10387476
Manufacturer:Elgin
Grade:270
Size:16s
Model:9
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1904
Case Model:Boss Scale 10k/20yr
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:7134334
Added By:tctimepieces Profile Image tctimepieces
2 Admirations
Serial No.: #6498628
Manufacturer:Waltham
Grade:Am.W.Co.
Size:0s
Model:1891
Jewels:11j
Setting:Pendant
Finish:Gilt
Est. Date:October 1894 - April 1895
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:7671430
Added By:shaunleatham Profile Image shaunleatham
3 Admirations
Serial No.: #17538929
Manufacturer:Waltham
Grade:No. 165
Size:0s
Model:1907
Jewels:15j
Setting:Pendant
Finish:Nickel
Est. Date:1908
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:7857631
Added By:AleN9ve Profile Image AleN9ve
0 Admirations
Serial No.: #648759
Manufacturer:Rockford
Grade:160
Size:0s
Model:1
Jewels:15j
Setting:Pendant
Finish:Nickel
Est. Date:1904
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:7994550
Added By:Hbhostetler Profile Image Hbhostetler
4 Admirations
Serial No.: #16570515
Manufacturer:Elgin
Grade:298
Size:0s
Model:2
Jewels:7j
Setting:Pendant
Finish:Gilt
Est. Date:1912
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:8220759
Added By:JeffWinBrisbane Profile Image JeffWinBrisbane
3 Admirations
Serial No.: #2342546
Manufacturer:Illinois
Grade:A. Lincoln
Size:16s
Model:5
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1911
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:8481349
Added By:Brycef Profile Image Brycef
5 Admirations
Serial No.: #4491517
Manufacturer:Illinois
Grade:Bunn
Size:16s
Model:11
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1923
Case Model:JBOSS
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9106614
Added By:Gimparoo Profile Image Gimparoo
2 Admirations
Serial No.: #26525354
Manufacturer:Elgin
Grade:463
Size:3/0s
Model:3
Jewels:7j
Setting:Pendant
Finish:Nickel
Est. Date:1924
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9282081
Added By:BOnd08 Profile Image BOnd08
7 Admirations
Serial No.: #22554694
Manufacturer:Elgin
Grade:453
Size:16s
Model:15
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1920
Case Model:J.Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9338317
Added By:ultimatekaiser Profile Image ultimatekaiser
5 Admirations
Serial No.: #22556819
Manufacturer:Elgin
Grade:455
Size:16s
Model:15
Jewels:19j
Setting:Lever
Finish:Nickel
Est. Date:1920
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9391841
Added By:Rickglick1 Profile Image Rickglick1
2 Admirations
Serial No.: #2415029
Manufacturer:Hamilton
Grade:992
Size:16s
Model:2
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1926
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9397875
Added By:kerry104 Profile Image kerry104
4 Admirations
Serial No.: #4406781
Manufacturer:Illinois
Grade:Bunn Special
Size:16s
Model:9
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1923
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9409945
Added By:NickYorks Profile Image NickYorks
5 Admirations
Serial No.: #24627288
Manufacturer:Elgin
Grade:454
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1922
Case Model:J Boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9428207
Added By:Rickglick1 Profile Image Rickglick1
3 Admirations
Serial No.: #14883140
Manufacturer:Elgin
Grade:301
Size:12s
Model:2
Jewels:7j
Setting:Pendant
Finish:Nickel
Est. Date:1910
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9534094
Added By:Jason410 Profile Image Jason410
4 Admirations
Serial No.: #18616353
Manufacturer:Elgin
Grade:388
Size:16s
Model:15
Jewels:21j
Setting:Lever
Finish:Nickel
Est. Date:1916
Case Model:J boss
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9560987
Added By:ultimatekaiser Profile Image ultimatekaiser
7 Admirations
Serial No.: #26615679
Manufacturer:Waltham
Grade:Vanguard
Size:16s
Model:1908
Jewels:23j
Setting:Pendant
Finish:Nickel
Est. Date:1928
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9619314
Added By:SeikoDiverSRP043 Profile Image SeikoDiverSRP043
11 Admirations
Serial No.: #23100061
Manufacturer:Waltham
Grade:Maximus
Size:16s
Model:1908
Jewels:23j
Setting:Lever
Finish:Nickel
Est. Date:1919
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9625668
Added By:chasofvt Profile Image chasofvt
6 Admirations
Serial No.: #756865
Manufacturer:South Bend
Grade:313
Size:18s
Model:2
Jewels:17j
Setting:Lever
Finish:Nickel
Est. Date:1912
Case Model:Boss Scale 10k/20yr
Case Material:Goldfilled
Gold Karat:10
Guarantee:20
Case Serial:9628358
Added By:tctimepieces Profile Image tctimepieces
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