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Moped
(formerly known as Motorbike)
Motorbike plates were first introduced in 1920 and continued to be issued through 1949. In the early years they were sometimes referred to as Motor Bicycles or Bicycle Side Motors; today they are more commonly referred to as Mopeds, short for motorized-pedalcycle. Also, in the years up through 1933, the letter "O" was used on Motorbikes as a prefix to differentiate between them and Motorcycle plates. At least up through 1927 the letter "O" and the number "0" were the same size which makes earlier plates appear to be all numeric. From 1934 through 1949, the "O" was replaced with "MB" stacked on the left or right side, then with the introduction of the map outline in 1938, all plates had "MB" stacked on the right side. It should be noted that Motor Boat License plates also used the "MB" designator between 1955 and 1963. Thanks to Eric Tanner for some guidance with this section.
1920 - 1929
1920 (First Year)
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O806 Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: white on dark blue |
4 1/2" x 6" 4 1/2" x 8" |
Not offered on this format | Not offered on this format |
1921
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O677 Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: black on gold |
4 1/2" x 6" 4 1/2" x 8"  From Bill Krellner |
Not offered on this format | Not offered on this format |
1922
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O138 According to records, O1 - O1700 were ordered for this year Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: brown on cream |
4 1/2" x 6" From John Willard 4 1/2" x 8"  From unknown |
Not offered on this format | Not offered on this format |
1923
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O165 Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
4 1/2" x 6" 4 1/2" x 8" |
Not offered on this format | Not offered on this format |
1924
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O76 Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
4 1/2" x 6" From John Willard 4 1/2" x 8" |
Not offered on this format | Not offered on this format |
1925
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: none observed Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
4 1/2" x 6" 4 1/2" x 8" |
Not offered on this format | Not offered on this format |
1926
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: none observed Plates measure: - O1 - O99: 4 1/2" x 6" - O100 - O9999: 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
4 1/2" x 6" 4 1/2" x 8" |
Not offered on this format | Not offered on this format |
1927
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: O1 - O2 All plates measure 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
 From John Willard |
Not offered on this format | Not offered on this format |
1928
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: none observed All plates measure 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: dark blue on gold |
|
Not offered on this format | Not offered on this format |
1929
| Notes | Number Plate | Personalized Plate | Sample Plate |
|
Observed serial range: none observed All plates measure 4 1/2" x 8" Manufactured in Pennsylvania prisons Issued in singles Colors: gold on dark blue |
|
Not offered on this format | Not offered on this format |