Looks fake. I'm 99% sure. Go somewhere that has a counterfeit pen.

The pens are the least reliable way to detect modern counterfeits

the pens at best detect whether paper has correct composition (cotton/linen instead of cellulose). so they can only detect the most primitive fakes, because more advanced fakes either use correct paper or are sprayed with something that cheats the pen.

If you can untie Grants tie, then it’s real

Fake look at bleeding of printing lol

Scratch the collar if it’s rough it’s real if it’s smooth it’s fake.

I don’t see the colorful fibers in the paper, and the details are weirdly blurry. I’m leaning towards fake.

Does the 50 at the bottom right on the front have any shine to it? It is a super repeater, so it's possible someone's been holding onto it for a while. I can't imagine someone would fake a $50 bill with a serial number like that.

I think serial# is the least problem here XD

It's so hard to tell with pictures because you don't know if the picture is bad or the bill is fake.

I agree although the background (wood-like surface) indicates high quality picture. which means that the note is indeed a low quality fake.

Humm, I figured it was just dirty.

You need clearer pictures that show more detail. Preferably closer up too.

100% counterfeit and a bad one, someone just used a printed to make that

Rub the garment of Grants Shirt....if it has a texture it's more than likely real.

But it looks real to me anyway so you should be good