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Breguet

5817 question

 

Hello. I have a question I was hoping someone might be able to help with. What does the serial number mean on a 5817, specifically with the letter? I've seen some with 4-digits and then a letter (R, Z, ect...). What does the letter pertain to? The four digits? Do they have anything to do with the year made, or calibre used?

Thanks in advance.

 

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