Strange Macbook Air display code: NT133WGB-N81

Hello!

So, I've bought this early Macbook Air 2015 and I wanna check if it wasn't refurbished or something. I used the command in the terminal to learn about the display code and it got me to this : NT133WGB-N81.

Now, I am curios if this is the code of the displays put into the MBA by Apple or is a genuine replacement part or what else?

Thank you for your help!