Recently picked up a Sonic Mars Trek pin. The playfield glass is not original, the seller had it made for him by a local glass company and I suspect it is plate glass (bad!).
Can anyone tell me how I can confirm this is actually plate glass (without breaking it), or conversely that it is tempered glass? What would you look for, and what if any tests could you do? I necessary I'd even be up for a test that would destroy plate glass as long as it would leave tempered glass unharmed and the test could be conducted safely.
There is no tempered logo on the glass, but I know shops have been known to sell tempered glass without the logo. The glass edges seem more angular rather than tempered glasses I have on other pins that have the edges smoothed a bit more.
If it is plate glass then I'll replace it with tempered before anyone gets hurt.