This flag was acquired as part of a larger grouping of personal items belonging to an officer of the 1st Anti-Tank Regiment of the 1st Armoured Division. It was supposedly a souvenir kept from his WW2 military service. It is made of a double layer of cotton type fabric and measures 16˝ x 12˝ inches (~42cm x 32cm). This seems a little large to be a car flag, but I do not know if flags fastened to military vehicles were regulated to be a specific size.
I am also curious about the fastening system, and whether this is typical of vehicle flags. I do know that this is how banners were suspended from military marching band instruments, such as trumpets and kettle drum drapes.
By chance does anyone have any info or period photographs showing flags used on passenger cars, or maybe even armoured vehicles on parade?