I have an identical AC to the one Johan shows. The back is less scooped than the one Phillipe shows. On mine the pin is stamped L/21. The pin is silver plated.
I also have a L/21 marked sub badge. The pin shows some wear and looks to be made of brass.
I foolishly let an unmarked L/21 destroyer badge get away from me.
Tony
An opinion should be the result of thought, not a substitute for it.
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