Hi everyone, I hope this is the appropriate place to ask some general questions. I've been taking an interest in Oakley Spikes and I'm hoping to get some insight regarding the "Light Frame/Titanium Lens" version. I've noticed on Ebay/Google pics that some Spikes have a serial number on one of the inner arms and some that don't (example 05-932). Does having the serial number on the inner arm legitimize them or were there some that didn't have the serial number? I have noticed the odd picture of Spikes without the serial number on the inner arm. Would different Spike versions or different production times have any bearing on this? Look forward to anyone's knowledge on this. Thanks!