[DavidG]

Sounds like a car built as RHD and then converted to LHD. There were four countries that I'm aware of that made the switch after WWII (Argentina, Paraguay, Sweden, and Uruguay), all of which originally had kilometer speedometers.. After the change, some cars were converted, such as yours perhaps, and some were not, as it wasn't mandatory.

Imagine the chaos on the roads on the day of the change and in the months that followed. Further, imagine the extent of preparations before the BIG day. Everything from doors on both side of busses to a complete duplicate set of road/highway street signage.