I am uneasy about it. First of all it goes against the all-brass rule. However it is quite possibel that this was an exception/maker's error or was commissioned by the regt for wear on an order of dress. If it was blackened brass then it could be for a variety of reasons even for wear in tropical headgear or a wartime affection.
However my main concern is that the Firmin mark is unheard of on ORs badge before 1940s/50s.
Alan
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