pocket watch serial numbers

[SDDS]

Hey guys, i would like to get an answer for this question, i have an antique rolex pocket watch british military serial number B7231 as shown, but what iam surprised is that i found on the net just like my pocket watch different dial but has the same serial number, i did some browsing on different rolex pocket watch , and i tracked a serial number for a specific model and then i was able to find the same pocket watch but with the very minor difference, so is this can be true?

Thanks for any input guys here is mine


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