Wow
Like I said...never seen that before. The requirements for safety glasses is that the lenses should have the manufacture's monogram etched on the them. Then, all remaining components must have Z87 on them. Example: If the frames are one piece, then it only needs to be displayed once. If, for example, there are detachable side shields, the side shields must also display Z87 on each of them.
Take a look again at the lenses. Are you sure it's not the manufacture's monogram? I'm baffaled.