I200M - Museum of London
This I200M is owned by The Museum of London and has been in their storage facility since 1983. It is one of the odd colour scheme variants that I come across every so often - the turquoise cabinet which was not standard issue on UK models, with the standard pink cap that is usually matched with the charcoal cabinet.
We don't know why Balfour chose to manufacturer a small number of these units with a hybrid colour scheme. Why would they go to the trouble of manufacturing a turquoise BAL-AMi cap sign, and not produce the top cap in the same colour? We'll never know!