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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"


From Clayton Moore
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