The SD badge and armband are the two shown in Margaret Nobbs' 'Nobbs Notes', and the only ones I've seen. Re your points though, Jon does say in his original post that the SD armband (with stripe top and bottom) was later replaced by the horizontal striped arm flash. Perhaps Flight was quoting an early thought on design with was changed in practice?
I'd think the design of SD armband follows that of most others- wool construction, embroidered SD lettering, backed in cotton canvas and closed with poppers. The stripes top and bottom are pale blue. The ATC armband is sewn closed (non adjustable) and simply printed in dark blue on a white cotton canvas cloth. It was introduced in 1941 and of identical design, still worn today.
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