Definitely pass on it. It is Heavily infested with Zinc Pest.
"Much that once was, is lost. For none now live who remember it."
It's an original badge. That is NOT zinc pest, it could be merely white rust or perhaps even metal polish residue as other badges you've posted here have exactly the same appearance and it can be easily cleaned or treated as the need may be.
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
A careful wash with soapy water and an old toothbrush should work wonders.
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Nice unqualified zinc airgunner badge.
Taking in the consensus of opinion that this is an original badge I do feel quite comfortable giving this one the thumbs up.
The pin looks as though it has had a period repair.
On the front of the badge it is obvious that the badge has undergone some serious polishing and as Ned points out this would be easily removed using a bit of care. (I use carnauba wax car polish as this doesn’t contain any salt unlike most ‘washing up’ liquids)
Thanks for all your replies, it's been really helpful. Cheers. Steve