I ordered Sanwa OBSN-30 buttons from a Chinese vendor (I know, stupid 
). After testing I noticed that the buttons feel different compared to my OBSF-30 and they make a really ‘springy’ noise. I also noticed the color was off and the logo on the buttons was a bit different. They have most markings like numbers on the bottom and the microswitch as my OBSF-30 has, but they miss the markings inside the button cap.
(Two on the left have a 1 and T, two on the right are the ones I received.)
I couldn’t find any photo’s online and I was wondering if someone could share a photo of the inside of a OBSN-30 button cap. I probably received counterfeit but I wanted to confirm.