Exposition Nationale Suisse Lausanne 1964 Gold coin

I have a Gold Exposition Nationale Suisse Lausanne 1964 coin. I have found them in silver but have been unable to find anything about a gold version. Can anyone help?

 

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here is a pic

 

I can not find anything on it. are you sure it not gold plated silver ? or does it say gold on it ?

 

It has Argor 900/1000 across the bottom. It was in a collection of gold coins I inherited from my grandfather. All the other coins were gold. This one has me stuck.

 

does "Argor" mean gold plated silver ?

 

They made it in gold, too. Should be 33mm and 27.02 g .900 gold.
Argor is the company. You may have heard of Argor-Heraeus.

Here's one:
https://www.numisbids.com/n.php?p=lot&sid=581&lot=2536

 

What I found is that ARGOR is a processor of precious metals they make coins and bars. I suppose this could be gold plated. Its just strange that there are no other ones at least that the old internet can show me.

 

Thanks!