The Mercedes-Benz 600 front and rear turn signal bulbs both utilize a P21W size. The replacement chart covers 1964 to 1972 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz 600 uses the P21W bulb for both front and rear turn signals across all model years from 1964-1972.
The P21W is an ECE-standard single-filament bulb rated at 12 volts and 21 watts, designed primarily for signalling functions such as turn indicators.
P21W bulbs use a BA15s bayonet base, which is a single-contact bayonet fitting with a 15mm collar width.
The BA15s base designation indicates a single-contact configuration, meaning it is not interchangeable with BA15d-based bulbs, which carry two contacts at the base.
The ECE standard classification of the P21W means the bulb conforms to regulations recognized across Europe and many other markets worldwide.
The 21-watt output of the P21W is a value associated with turn signal and brake light applications, where higher intensity is required compared to typical parking or position lights.
The uniform use of P21W across both front and rear positions on the Mercedes-Benz 600 means a single bulb type serves all four turn signal housings on the vehicle.
Because the P21W is a single-filament bulb, it serves one function per housing and is not suited for dual-function applications such as combined stop and tail light duties without a separate bulb.