[CLAS-93… ] ??
I think you're in the ballpark, bitt, if not even closer.
Since its in brackets, it made me think of the about 80 gaziliion times Q posted weird codes inside brackets. I searched Q map for 93 DK, and [93 DK] and 93 and DK. Nuffem.
But I wonder if you looked at all sevent-two bajillion of those type of posts, one might come up with 93 and DK in it. The blank spacing is obviously the rest of it, but Q's being tricksy.
Anyway, just dropped that in real quick.
Stay on that path, bittsky, you might find something.