The book stops listing serial numbers at VHN (1998). It also says that 3913NL's were produced from 91-94 with the TEE prefix. Of course, S&W is great at mixing up serial numbers and making strange transitional models. My 4006 made in 2001 is a non-TSW model even though they were making TSW's by that time. If there is someone else around with the same prefix, they might know of a better, more accurate date. Just remember, S&W is good at a lot of things, including making sure they find ways to keep us S&W fans confused.
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J.D. Roy
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