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Keystone Howard Age Determination by Serial Number
| Year
|
S/N
|
| 1902
|
850,000
|
| 1903
|
900,000
|
| 1909
|
980,000
|
| 1912
|
1,100,000
|
| 1915
|
1,285,000
|
| 1917
|
1,340,000
|
| 1921
|
1,400,000
|
| 1930
|
1,500,000
|
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