u/Willing-Succotash-95

Hello guys, I am currently having a little problem(maybe a big lol) figuring out the size of NVA Paratroopers Beret in cm.

They do have a normal size markings in most of their Berets but sometimes there are some of them marked with number 1, 2, and 3(There could be more but I have not seen yet) so I can not find the proper info about this sizes.

So does anyone know about this size markings? If so, can you tell those sizes in cm?

I am looking foward for your kind answers.

Thank you.