Apple reportedly experimented with a dark ceramic back for the Apple Watch Ultra, according to documents filed with the United States Federal Communications Commission (FCC). 

The documents, spotted by @ParrotSWD on X/Twitter, suggest that Apple may have initially considered a darker color option for the smartwatch before ultimately settling on the current titanium finish.

Apple Watch Ultra black prototype

The FCC documents, which were part of Apple’s application for the Apple Watch Ultra prior to its release in September 2022, include images of a prototype with a dark ceramic back that closely resembles the ceramic back found on the Apple Watch Series models. 

The prototype also features a plastic-looking Action button with no indent, a design element that differs from the final release of the Apple Watch Ultra.

As per MacRumors, it’s likely that the confidentiality clause associated with the FCC filings for the Apple Watch Ultra has recently expired, allowing the images of the dark ceramic prototype to surface now. 

Apple currently offers the Apple Watch Ultra 2, released in September 2023, in the same natural titanium color as the first-generation model. While rumors prior to the launch of the Apple Watch Ultra 2 suggested that Apple might introduce a darker color option, this did not materialize.

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