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Here’s a story built around the idea of an "X serial number Rolex" — a detail that, in the watch world, can signify a specific era, a factory anomaly, or even a lost provenance. The X-Factor

The Swiss voice hesitated. Then: “Because it’s not running on a mainspring, Marco. We measured the one we recovered in ’64. It runs on decay . The tritium isn’t just luminous. It’s a slow, cold nuclear battery. That watch will tick for another three hundred years. But whoever wears it…”

It had been running on its own for sixty years.

“Marco,” said the Swiss-accented voice, tense. “Where did you get that number?”

Marco’s gaze drifted to the back of the case. There, scratched into the metal by a crude hand, was a single word in Italian: Fantasma .