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The glass is intentionally different. The sports one is supposed to be more shatterproof but scratches easier. The stainless model is much more scratch resistant but shatters easier.

My wifes Series 2 lasted a few years with minimal scratching, she got a Series 5 and the face is basically ruined after a year and a bit. It is SO bad.

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Sapphire on the higher end ones, "Ion-X" (gorilla glass) on the cheaper ones.

Sapphire is more expensive than chemically strengthened glass.

So "Sapphire & Steel"

Incidentally the initial working title for the UK science fiction series bearing that name was "The Time Menders" :-)

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