red diamond steel plate - equivalents required
 

red diamond steel plate - equivalents required.
i'm looking to identify some steel plate known as red diamond - it looks like it says either "146" or "14g" after it.
is there modern day an equivalent? i believe it to be a wear resistant plate material from some time ago.
hope someone can help - i've searched the internet but no luck so far.
thanks in advance!
well, how thick is it?

mike halloran
pembroke pines, fl, usa