Serials: 2 consecutive numbers

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A little off topic, but my wife and I have consecutive driver's licence numbers. It is pretty convenient for when I need her number, I can just look at mine and remember hers ends in 0 not 1.
 
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And how did that happen?
 
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And how did that happen?

We moved to a new state and applied for new licenses at the same time.
 
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Of course. Makes sense
 
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Other consecutive serials (Mido Multicenterchrono ref. EDLA 3000). Mine on the right and on the left the one found un a US site.