Is this a legit minting error or fake?

Can you please look at this 1 agora coin and help me understand whether it's a legit minting error? 

I do not see traces of mechanical damage on the coin. 

In the most occasions you should see in the opposite corner of the ‘clipped’ part, also a ‘weak struck’ part.. 

That's called the Blakesley effect.. 

Don't know if i can put here a link to another website.. but if you do an internet search with:  “Blakesley effect” you will find enough info.. 

Here some more info about the Blakesley effect:

https://en.numista.com/forum/topic103266.html

https://dniewcollectors.blogspot.com/2013/11/1979-10-cents-rim-clip-errors-with.html

I doubt if this is a clipped error. That doesn't explain the straight edge, that edge should also be scalloped but on the inside in stead of on the outside.

I thought that maybe it was cut on the edge of the sheet? 

According to what i can find in the Internet sheet from which coins were cut looks like the attached picture, so if a coin would be cut in the edge of it there might be straight edge.