Para Berets Eyelet Oddity

[tcrown]

I have noticed on several para berets that the paint of one of the eyelets seems to have been deliberately removed, revealing brass underneath. I was wondering if any of the forum members would have an explanation. Would it be something which relates to some sort of tradition in the Parachute Regiment? I haven't seen the same on other army berets.
See the photos below of three different berets with the same characteristic. It doesn't seem to be a coincidence.
Thanks for your ideas/comments.