I am not so sure, it could be the badge has been chemically cleaned and just looks new.
I have pictures that show 3 different types of lugs used on the FCTB badges and am leaning to there being two variations.
The brass FCTB badges have a 957 RD number and the silver FCTB badges have a 958 RD number.
This is not my badge but looks similar to the one pictured.
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