My first DART purchased new from Hearns Hobbies in Melbourne in 1953 was pinkish red in colour on the head.
I loved and used it, but sold it with other diesels I had in 1958 when MGs and good looking girls took over.
I did buy an unrun DC version about 30+ years ago that starts and goes well. It's in a F/F Celeritas from 1953 Aeromodeller Annual as the first one was way back then.