Seen on eBay, an Apple Watch that isn’t actually a prototype… but still quite unusual: it’s the one that connects to a display stand in-store.
It’s in demo mode (and I’m not sure if it’s possible to flash a standard OS on this specific type of watch) and is in poor physical condition. You can clearly see the differences between this watch and the commercial model: four screws to attach it to the stand, four protruding pins, and a more accessible debug connector. The opening makes using standard straps a bit tricky, too. Finally, the watch was sold with the flex cable (but without the Lightning connector on the end…) and the plastic bridge that serves as a stand.
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