The 'D' prefix indicates that it's a Model 10 (steel frame) or Model 12 (aluminum alloy frame). According to the Standard Catalog of S&W, the 610xxx serial number range is 1973-1974 production. The gun should have nickel finish, not stainless; the serial prefix is wrong for a stainless S&W revolver from this time period. In the condition you describe, a nickel Model 10 would be worth $250-$325 with the relatively common 4' or 6' barrels, ~$25 more with the uncommon 5' barrel, and up to $100-$150 more with the rare 3' barrel which was only offered by special order in this era. The correct numbers-matching box, documents, and tool kit will add $50-$75 to the value. A Model 12 will be worth ~$100 more than the Model 10 value. Since you say the gun is 'not snub nose', it should have a 4' barrel; M12 lengths other than 2' and 4' are rare to the point of near-nonexistence. FWIW original factory nickel can be identified by color case finish on the hammer and trigger, blued finish on the ejector star and ejector rod, and natural metal on the cylinder pawls. Poorly-done refinishing can usually be identified by nickel plating in these areas; unfortunately, poorly-done renickeling jobs were common in the 70s and earlier. This will typically knock the gun's value down by ~30%.
Smith And Wesson
S&w 38 Special Serial Numbers
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