FS - Abc gold labelled silver pin? Unique? Rare?

Hi all,

Have a strange pin I bought a little while back. Stamped ABC 0.1oz gold 9999 on the front but it's been tested as silver and is labelled SIL on the reverse. I'm no expert in this area but putting it alongside a genuine 0.1oz gold piece (see pics) after I bought it, all the stamping looks similar to the genuine from factory? Perhaps it's an old prototype?

Weight is 2.67grams on my scales. Made to similar / close to dimensions as the real gold piece.

I snapped it up at the time with the intention of starting an ABC small bar / pendant collection but am offering it up for sale. Not letting this go cheap - if there is interest make an offer.

Although I'm after fiat I'd also consider trades if it doesn't sell.

Best regards
Gsb