Trouble identifying the model or series Apple Watch I have

Hi,

The model number listed in the Apple Watch app is NJ3N2LL/A. i went to https://support.apple.com/en-us/HT204507 to determine which model it is, but that model number format is not listed on that page. I *think* it's a series 1 or 2, but not sure.

Can you please assist?

Thanks in advance.