Great Britain 1960, halfpenny. Coppernickel?

Plated and used as some kind of jewelry such as a button or a cuff link.

 

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These coins are supposed to be bronze (not cupro-nickel).
I doubt it is silver but I guess it's possible. I would weigh it and have the silver tested.

 

Just my opinion, but....
Could it possibly be a die struck replica in sterling (die made from copying a genuine coin)?
It does appear to have been joined to something else (perhaps by impulse welder?) like a cufflink. Any 'sterling' marking might have been stamped on that part.
Since the half penny, along with all the obsolete denominations, was demonetized so many years ago, it wouldn't then be a counterfeit coin.
Lots of copies floating around out there, many of them used for jewelry purposes.