Pertinax

I try not to grade legitimate ancients beyond "good condition" and excellent condition. With the phonies I feel free to make up anything I want based on the quality of the product. If I had banged this specimen out myself I would be reasonably proud of the results (altho Whiz is right about the fake beard thing). This doesn't make the grade as far as having to think twice about authenticity. The denarius did (I had to think twice I mean). With all the charlatans out there setting up shop in the garage as grading services I decided to set up shop right here on the sofa. You can send me cash money and I will certify your fakes for you with a "Genuine" Certificate of Inauthenticity (written on toilet paper) with the official seal of NFG Grading Service !
The best way to learn about spotting fakes is simply experience I am afraid. Some of the more recent 'stuff' does require researching the sites dedicated to spreading the word about the scammers out there.

I use 'Scotts'. If you were older (around 50) you would remember their TV commercials
"A thousand sheets ...... That's a lotta sheets !"

As soon as I saw this next coin the word 'style' came to mind.
The style of this coin does NOT remind me of any image of Pertinax. This coin just looks wrong.

To pick a fake coin on grounds of style is not a skill just restricted to collectors of ancient coins. Face recognition is essential for survival to all humans. Children and parents can easily identify each other in a large crowd.