So i had i guess you could call it a series 0, launch day as when the 1st Apple watch came out in 2015 SS Sapphire . The screen lifted from a swollen battery, so i sent it into Apple for repair. They kindly replaced it free of charge, and according to the repair status, it says they're returning a "Apple Watch Stainless Steel 42mm (1st Gen)" How do i know if i'm getting an original launch day single core, versus what is known as a series 1 'dual core' what numbers differentiate the single core versions to the dual core versions ? I won't get the watch til Mon, but whatever i get, i'll be happy. I was about to ditch Apple as the watch was the only thing holding me to them. I badly wanted an excuse to preorder the new LG V30, cos im a little upset at the cost of the iPhone X. Besides i want the wide angle over the telephoto. Anyway getting off topic here. Simply put, how do i know what version Apple has replaced my original launch day watch with.