Hi
Not knowing a great deal about rising suns (even though I do live in the general area they represent....) but that badge is quite "solid" and most of the ones I've seen (and got) are "hollow-backed" with the maker cunningly hidden like some "Where's Wally?" exercise!
Yes, I would suggest that you badge is not that common (lucky you!) and maybe post-WW1 issue. The gilding also suggests a superior "customer"!
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