S&W Model 3913

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Do you have the original box? If so, there should be a 4-digit "spec ord" number that can be decoded. The first digit represents the year so you must at least know the decade (in this case, probably a 9 for 1989). The next three digits will be 001 through 365 and are the day within the year.
 
Smith & Wesson customer service indicated a 3913 marked TEA47xx was manufactured in February of 1990. Should be close to yours.
 
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