Hi Warsaraftype.
I've been collecting to the Observer Corps /Royal Observer Corps for a while now, and like you have the star on the older pre-1972 grey fabric (as per the one you have illustrated). I have never come across the gold spitfire for 25 master test passes on the grey backing, and find the production of the star a bit of a misnomer really - for the reasons you cite.
I've also never come across a reference to one. I cant definitively say that one doesnt exist, but the reality is that the time line of approval and production would lead one to conclude it shouldn't; and if it does I doubt it was ever officially issued.
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