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Stamped on frame grip butt 2D336xx. I understood the letter had to come first with six consecutive numbers.
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You are correct that S&W began the D-series sequence (in 1968 incidentally) with the letter followed by six digits. However when they reached s/n D999999 in late 1976/early 1977, rather than start a new letter series they just moved the D over one space and put a 2 in front.
Your revolver was made in 1977, when s/ns ran from 2D00001 to 2D80000.
S&W kept this system up until they got as high as 21D0883, at which time they changed to the three letter/four digit system they continue to use today.