Hey Ian
The previous owner had the helmet restored and added the silicone, now this is gone it looks a lot better, much more like it should do. They buffed the helmet to restore the shine, it has now since yellowed again. I personally would never have touched it but each to their own, I am just chuffed to be able to own an original, it was a lifelong dream, I expected it to take me at least until I was 50 not 28! LOL
Here are a couple of pics pre-restoration of the mic tips:
Joe