Hi, Graham...
Glad the information was of use to you...
. White would most likely have been the colours of the spinner rings in this case. On occasion, spnner colour was used to indicate
Gruppe status rather than Staffel status, but if that was the intention with this example, that would also be white as fourth Staffel fell within II.Gruppe, whose I/D colour was also white. More often than not, though, spinner colours were used to confirm Staffel status.
Regards...
Paul