Letters denoted the city (DS for Dar es Salaam) and was followed by four numbers.
One style has the hologram and the flag at the left side of the plate followed by "T" and the numbers and characters.
Diplomatic plates for international and regional organizations (United Nations funds and programmes, World Bank...) are white-on-blue.
Earlier Zanzibar plates used a different number system from the rest of Tanzania.
[1] By the 1970s plates had changed from the white-on-black style to the black-on-white and black-on-yellow system as used in Britain.
Unlike the rest of Tanzania, white plates in Zanzibar were also used on personal vehicles.
The 1980s numbering system in Zanzibar was similar to that in the rest of Tanzania, except the preceding 'T' was replaced with a 'Z'.