It’s not really a secret that products undergo multiple iterations, some of which hardly look like the finished version that eventually goes on sale. Prototypes are often closely guarded secrets and most get discarded and destroyed, never to be seen by the public’s eyes. Once in a while, some do miraculously make it out.
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https://www.slashgear.com/apple-watch-prototype-with-working-pre-watchos-1-0-surfaces-28652765/