I had mentioned in my post above that ERA's wore no rate or rank insignia (other than Chief ERA's), the only badge you might include in your display would be the cap badge you can see the ERA's in the photo I have above post their cap badges.
It would look similar to the one I have attached below. This is the King's crown version in use from 1901. If he made Chief ERA he would have worn the CPO cap badge which is similar.
Bryan
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