Definite fake - sorry but will not disclose how I can be so emphatic - please excuse me, but we are best keeping some knowledge to ourselves to stop fakes.
All the best
Mike
Having posted the above - I want to be helpful so add this which is an example of the standard insignia
https://www.iwm.org.uk/collections/item/object/30060234
Variants are highly unlikely given the diminutive size of the unit