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Tractor
Tractor plates were first issued in 1914, and used an E prefix, standing for Engine until 1927, from 1928 to 1933 a TE prefix, meaning Traction Engine, was used. Then the prefix was removed and the word TRACTOR was used as the legend until the discontinuation of tractor plates after 1983. Both the 1971 and 1977 bases used the prefix TR. In 1984 tractor plates were replaced by two different types. If the tractor was used for industrial purposes, it received a Special Mobile Equipment (SME) plate. If the tractor was used for agriculture, the vehicle was issued an Implement of Husbandry (IMP) plate. There has been a proliferation of SME plates and profound scarcity of IMP plates. As of the end of 2011 there were 24,367 SME plates in use and 216 IMP plates.
1920 - 1929
1920
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E1 - E2-320 All plates measure 6" x 16" Manufactured in Pennsylvania prisons Issued in singles Colors: white on dark blue |
 From Tim Gierschick  (Repainted) From Clayton Moore |
Not offered on this format | Not offered on this format |
1921
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E1 - E4-163 All plates measure 6" x 16" Manufactured in Pennsylvania prisons Issued in singles Colors: black on gold |
 (Repainted) From Tim Gierschick  From Tim Gierschick  From Tim Gierschick |
Not offered on this format | Not offered on this format |
1922
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E1 - E4-283 All plates measure 6" x 16" Manufactured in Pennsylvania prisons Issued in singles Colors: brown on cream |
 From Tim Gierschick  From Bill Krellner |
Not offered on this format | Not offered on this format |
1923
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E1 - E3-182 All plates measure 6" x 16" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
 From Tim Gierschick  From Tim Gierschick |
Not offered on this format | Not offered on this format |
1924
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E1 - E1886 Plates measure: - E1 - E999: 6" x 10" - E1000 and above: 6" x 12" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
 (6" x 10") From Tim Gierschick  (6" x 12") From Tim Gierschick |
Not offered on this format | Not offered on this format |
1925
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E-1 - E3084 Plates measure: - E1 - E999: 6" x 10" - E1000 and above: 6" x 12" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
 (6" x 10") From Tim Gierschick  (6" x 12") From Tim Gierschick |
Not offered on this format | Not offered on this format |
1926
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E-1 - E4-552 Plates measure: - E-1 - E-99: 6" x 10" - E-100 - E-999: 6" x 12" - E1-000 and above: 6" x 13" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
 (6" x 10")  (6" x 12") From Tim Gierschick  (6" x 13") From Tim Gierschick |
Not offered on this format | Not offered on this format |
1927
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: E-1 - E4-199 Plates measure: - E1 - E999: 6" x 10" - E1000 and above: 6" x 13" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
 (6" x 10") From Jake Eckenrode  (6" x 10") From Clayton Moore  (6" x 13") From Clayton Moore |
Not offered on this format | Not offered on this format |
1928
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: TE-1 - TE4-060 Plates measure: - TE-1 - TE-999: 6" x 13 1/2" - TE1-000 and above: 6" x 15" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
(6" x 13 1/2")  (6" x 15") From Clayton Moore |
Not offered on this format | Not offered on this format |
1929
| Notes | Number Plate | Personalized Plate | Sample Plate |
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Observed serial range: TE-1 - TE5-237 Plates measure: - TE-1 - TE-999: 6" x 13 1/2" - TE1-000 and above: 6" x 15" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
 (6" x 13 1/2") From Bob Connison  (6" x 15") From John Willard |
Not offered on this format | Not offered on this format |