u/SergeHertz

Hi,
I’m coming to you all with a question.

Recently, my grandpa gave me a pair of headphones he had for a long time that are apparently called Koss Porta Pro 2. I’ve never heard of that model before. I already own the original Porta Pro, and after comparing them, they sound quite different.

So my question is:
Is this a legitimate Koss headphone, or is it some kind of counterfeit?
I couldn’t find any information about it anywhere.

For context, i am french and my grandpa used to travel a lot in asia.