Is this one authentic?

It seems not but I am not quite sure. Thank you.

The single layer twill teams are always harder to tell, the ball in the NFL logos on the neck and jock tags are the best indicators. The jocktag one looks a good shape, many fakes have a squashed ball which bleeds into the star to the right, making it look like a tail. This one doesn't have that. Can you take a pic of the neck equipment badge? I'd like to see that to be sure.

The numbers do look a little shiny, that could be the flash on your camera. Next thing to look at in detail would be the Reebok vector on the sleeves, look closely at them to see if there are any trailing threads going from each element, if there are it's a fake, as a genuine one would not have them.

Compare the jocktag with our guide here:
https://nfljerseyfanparadise.forumotion.com/Hemtags-h6.htm

And this thread should help compare the other elements:
https://nfljerseyfanparadise.forumotion.com/t908-close-up-comparisons-in-a-genuine-fake-tags-etc

And it was made in El Savador. Thanks a lot.

From what i can see I'd say genuine.

It's real. The shoulders and sleeves are spandex. The fakes don't have that from what I've seen.

I think it is possibly a fake, because of the crinkle in the numbers and if you look real close at the M on the manning, the stitching is off at the bottom.

Definitely 100% legit.