That's what I thought too, but the 1988 67 CPMY I just bought is *Hull ID "DK"* -- go figure!
The boat had an Owners Manual for a 60 - ID'd as DM.
Then Hatteras sent me 67 Owner Manual with "DM" all over it - except for a few pages with "DK".
So, I began to doubt myself - and (sacrilegious, I know) the Gods of the Hatterai.