The International 1200D uses a 198 bulb size for both front and rear turn signal applications. Replacement specifications in the chart span 1969 to 1970 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 1200D uses the 198 bulb for both the front and rear turn signals across the 1969-1970 model years.
The 198 is classified as a miniature wedge bulb in the T5 form factor, operating at 12 volts and drawing 2 watts.
The T5 designation refers to the tubular glass envelope width, expressed in eighths of an inch, placing the 198 bulb among the smallest in common automotive use.
At 2 watts, the 198 bulb produces a relatively low light output, consistent with its application in signal rather than illumination functions.
The 198 bulb conforms to ANSI standards and carries approval for use in both the United States and Canada.
The wedge base design of the 198 means the bulb is held in its socket by the tension of the base itself, with no separate metal bayonet or screw fitting involved.
The Light Duty classification noted in the specifications applies to both the front and rear positions for the 1969-1970 model years, indicating the bulb rating is consistent across all four turn signal positions on the vehicle.
The identical bulb size across front and rear positions means a single bulb type serves all turn signal sockets on the International 1200D for those model years, with no positional variation in fitment.