How to recognize soundproof glazing?

Hello, I have a question. We chose a higher sound insulation class for some windows for an additional charge.

Since the installation of the windows was very chaotic, I am not sure if the windows with the higher sound insulation class are also installed in the correct room.

We have installed this format several times, hence my concern. Now the question is how can I recognize this directly on the window?

I have already looked but found nothing directly on the window. Is there a tip here?

Thank you very much

Unfortunately, I no longer have records of what such codes are, but when you look at the edge of the pane package, you can see an embossing - you can then google that (and it should differ between the windows in question).

Perfect, thanks, I'll check that right away and am looking forward to it. Best regards