Just a guess that the large green spot to the right of the teeth and the other small spots weren't intentional.
It's a cool cap and I love it but I'd prefer a "mint" one.
Definitely trash, I would now estimate its value to be worth roughly one blue on yellow GMK Esc, just the like one I have next to me that I would be happy to trade to you
![Wink ;)](https://cdn.geekhack.org/Smileys/solosmileys/wink.gif)
Personally I don't see that noticeably impacting the value. At least from my own viewpoint, I don't really consider anything to be a "defect" unless it's some sort of fitment issues (eg. stem issues), as long as it came from the cap-maker that way. To me, defects are things like coloring a key with dye, using a marker on the eyes, spilling something that stains, or nicks and scratches.