I was the original importer of Vorwerks to Britain in the late 1970s. The bantam version has been created in UK since that time.
They are indeed a beautiful bird, can be a little flighty but then they are a lightweight !!
I have known some be very quiet so it is probably all due to the method of raising/socialising.
There are quite a lot poor coloured birds around... the bosy should be buff (any shade) but no mossiness/peppering on saddle feathers. Necks & tails jet black, blue/grey legs.