The RIFs with the curved brass reinforcing are factory made rather than a local modification. This is apparent by both the professionally brazed attachment and also lack of any traces of loops being fitted to the coronet.
In my belief these are later badges, likely post WW2. To date I have seen badges with this construction marked by Firmin and Dowler. The Dowler made badges lack braze holes whilst the Firmin badges have a more die cast reverse especially apparent behind the flames, with 2 N-S circular braze holes.
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