Anybody ever seen an Apple Watch marked 'Ceramic Back' and 'Ion-X Glass' both, on the back? I just bought a used Watch online with that label, the layout looks like to the standard Watch ring of text marking on the back. It does not say Sapphire or Composite. Luckily, Apple site says the serial # is Unlocked, that was my main concern. I can return it if it doesn't work.