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Omnibus
From 1926 to 1929, omnibuses that carried passengers for-hire and not required to have a certificate of convenience were designated by an "H" prefix. This also included buses that were not registered for hire before 1/1/1914. In 1929, a new law was passed requiring all buses to have this certificate, thereby ending the "H" prefix plate. Following this, all common carrier and for-hire buses used the "O" prefix until 1968 when the "BA" prefix came into use. Omnibus became its own type again starting in 1977.
Thank you to Jake Eckenrode and Eric Tanner for this information.
Text in red indicates changes from previous base/format.
1926
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Serial formats: H-1 - H-99 H100 - H999 H1-000 - H9-999 Observed high: H1-621 - Plates measure: H-1 - H-99: 6" x 10" H-100 - H-999: 6" x 12" H1-000 - H9-999: 6" x 13" |
 (6" x 10")  (6" x 12") From Clayton Moore  (6" x 13") From Jerry McCoy |
Not offered on this format | |
1927
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Serial formats: H-1 - H-99 H100 - H999 H1-000 - H9-999 Observed high: H468 - Plates measure: H-1 - H999: 6" x 10" H1-000 - H9-999: 6" x 13" |
 (6" x 10") From Jake Eckenrode (6" x 13") |
Not offered on this format | |
1928
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Serial formats: H-1 - H-99 H100 - H999 H1-000 - H9-999 Observed high: H767 - Plates measure: H-1 - H999: 6" x 10" H1-000 - H9-999: 6" x 13" |
  (6" x 10") Both from Jake Eckenrode (6" x 13") |
Not offered on this format | |
1929
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Serial formats: H-1 - H-99 H100 - H999 H1-000 - H9-999 Observed high: H1-001 - Plates measure: H-1 - H999: 6" x 10" H1-000 - H9-999: 6" x 13" |
 (6" x 10") From Jake Eckenrode  (6" x 13") From Jake Eckenrode |
Not offered on this format | |
As mentioned above, "H" prefix Bus/Omnibus plates ended in 1929 and then restarted in 1977.
1977
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Observed serial range: OB-10000 - OB-24604 - Sticker wells at top-left and top-right |
 From John McDevitt |
Not offered on this format | |
1984
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
- Observed serial range: OB-26298 - OB-49201 - Sticker well at bottom-left |
 From John McDevitt |
Not offered on this format | |
2000
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Format 1 (Sans serif "I" in OMNIBUS) - Observed serial range: OB-51358 to OB-58543 - Sticker well at top-left |
 From John McDevitt |
Not offered on this format | |
|
Format 2 (Serif "I" in OMNIBUS) - Observed serial range: OB-59272 to OB-60410 - Sticker well at top-left |
 From John McDevitt |
Not offered on this format |  From John McDevitt |
|
Format 3 (Sans serif "I" in OMNIBUS) - Observed serial range: OB-61967 to OB-63977 - Sticker well at top-left |
 From John McDevitt |
Not offered on this format | |
|
Format 4 (Serif "I" in OMNIBUS) - Observed serial range: OB-64122 to OB-68870 - Sticker well at top-left |
 From Nick Tsilakis |
Not offered on this format | |
2006
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Format 1 - Observed serial range: OB-69000 to OB-86140 - Sticker well at top-left |
 From John McDevitt |
Not offered on this format |  From John McDevitt |
|
Format 2 (No sticker well) - Observed serial range: OB-86910 to OB-87506 |
 From Tom Perri |
Not offered on this format | |
|
Format 3 (Map outline in place of sticker well) - Observed serial range: OB-88268 to current high |
 From Bruce Bufalini |
Not offered on this format | |