The list we have, is only as accurate, as the information provided by our members.
Since 2005, Sig hasn't always labeled their cases with the information. In most cases, what we have is from members who have the information, and shared it.
In the case of your "U 741 XXX" you just need to see where it fits between those made earlier than it, and subsequent to it. Consider in likely equal monthly production quantities, and you you should be within a 2 month window. Normally it's the "UU" prefix numbers that are very sporadic, and out of sequence.
EDIT: Likely sometime in August 2006, call Sig Customer Service, and they might be able to be more precise...
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