Just had another look at your badge pics. I'll still go with genuine but a later issue (I have an unnumbered bronze one with a much later "half moon" clip)
I was wondering if your one had been through a fire as there looks to be some scale to the back. Or when the "new" fixing was attached hard soldering (as opposed to the lead solder that we often see on all manner of badges) produced this.
I've carried out some repairs to badges over the years and know this side effect well. It can be removed by pickling in dilute acid, but remember to thoroughly wash this off and scrub with a soft brass brush.
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