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SCSW doesn't appear to list any SNs starting with "3D" - 1D, 2D, and 4D up to 30D, (and even D3), but no 3D. And there's no gap in the sequence of years listed where "3D" would fit, i.e., the list goes right from 2D99999 (end of 1978) to 4D00001 (start of '79). Mod. 10-8 was introduced in 1977 and replaced by the 10-10 in 1988, if that helps.
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FlyFish, While 3D doesn't appear in the manual, the S&W historian said that 3D was just a continuation of 2D. So in 1978 they had a very large production year.