I purchased this from Vinted for my son's Christmas present. Unfortunately, he isn't interested in watches or the functionalities offered by the Apple Watch so has asked me to sell it for him!
The black strap is original Apple/Nike, the navy blue currently attached is an aftermarket strap (worn for approx. 3 days).
Everything works exactly as it should, there are some superficial scratches to the screen, but not overly visible when on the wrist. Battery health is 86%. Comes with a USB charging cable. I have not idea if it is an official Apple charger or not, but there is no logo or branding on it.
Any questions, please ask.