Just because the lettering is different, doesn't mean it's fake. I have really old brushes and the lettering is huge in comparison to my newer brushes.
If you look at my collection post (the link is in my signature) scroll down to the brush pics. I have a 129 (first pic) and a 224 (second pic) where the lettering is huge. I bought these years and years ago so I know they are authentic.
Just be sure it's fake before you accuse the seller of selling a fake