Jack, I am no expert but I would suggest your bike has nothing to do with Malvern Star. There were numerous suppliers and many of them were just parts assemblers using BSA and other stuff. Until forced into local production by shortages MS was largely a parts assembler itself. Is the DD British or Australian?
This has great detail photos and information on Malvern Star WW2
https://onlinebicyclemuseum.co.uk/ww...ilitary-model/
I have recently picked up a MS ladies bike dated 1943. It has the BSA main sprocket and under the frame British Made with what looks like the BSA rifles. It is a two star. The 3 is 1943 (starting 0 for 1940 and the M is for Melbourne factory)
The navel gazers on the bike forums seem to agree that thousands of standard civilian bikes, including many ladies bikes, were made by MS during the war and supplied to the military. There was no requirement for the super strengthened military bike for 90% of use.
Looking at many AWM wartime photos I have yet to find a strengthened bike and everyone seems to be riding standard models.
I suppose any wartime MS (easily dated) could be trotted out as military much like the many Staff Cars painted up.