0407 means week 4 of 2007.
The B5
may represent the 9th and 10th digits of the full reference number. B means a black dial but I have never worked out a pattern for the numbers.
http://www.breitlingsource.com/articles_refnos.shtmlI don't think there's ever been a survey as to what codes members here have on their watches so I could be completely wrong!
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