These are called "dash numbers" or engineering changes, when the factory makes what they consider a significant mechanical change to the prior version. Sometimes these are minor (like reversing the thread direction on the ejector rod). Occasionally, a different "dash" indicates the same gun with a different barrel length.
In the 629-6, it is apparently the same as the -5 with the addition of the internal lock, which occurred in 2001. Hope this is helpful.
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Alan
SWCA LM 2023, SWHF 220
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