Sadly, I have to say that I am suspicious of the authenticity of the coin. The unnatural surface appearance caused me to take a closer look and I think that the serif on the cross-bar of the digit 4 gives it away. Here’s an authentic example together with an enlargement of the 4 alongside that from your coin.
View attachment 1982613
View attachment 1982614
On all authentic examples of this type that I have seen (irrespective of date and mint) that serif has an ‘up-tick’ at the end but not also a ‘down-tick’, as seen on yours.
In the 1970s there was an influx of counterfeits from both the Middle East and from Eastern Europe. Those were generally produced in gold, with the profit derived from their additional perceived numismatic value. Later fakes originating from China were gold plated but on a tungsten alloy core such that they were both the correct weight and also passed the magnet test as well as any surface metal chemical test. To me it looks like one of the latter.
Just my opinion, of course.