Hypoallergenic watch?

If you select the correct model with aluminium case, and the correct sport loop band, it is already possible to have an Apple Watch without exposed nickel. The magnets and electronics will still contain nickel and stainless steel but it is enclosed and it should never come into contact with the user.

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Apple Watch Feedback

<https://www.apple.com/feedback/watch.html>

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The aluminium alloy used for the watch case should not have any nickel in its official analysis - that would be an impurity if it reached measurable levels, and cause to reject the material. The difference in melting point between nickel and aluminium makes it extremely unlikely the refiner would even be able to cast acceptable ingots with significant nickel contamination. That doesn’t entirely rule out nickel, but if present it would be below the sensitivity of routine analysis.

It appears the other nickel containing components of the main watch body are enclosed or encapsulated within the watch case, and contact with them would only be possible by dismantling the device.