There is a good suggestion for the blue book
After looking through a copy of the  BB a long time ago, I remember thinking how odd it was that there was no index of logos. 
 I really thought for sure they would have corrected this oversight in later editions, and yet they have not. 
 
 I think it is a no brainer. I think it is very likey that at some point you will encounter a cue that has a marking, but is not obvious what it signifies. This case is a prime example. Is it a "dp" or a 

d: ? I mean you can just start by looking under "p" and "d", but there are many other markings that do not even have letters in them. Having maybe 8-10 pages ( maybe even less depending on format) of a cuemakers logo index would be very helpful. Just a pic of a log and a name of a cuemaker (and maybe a corresponding page number). It is possible that this maker may not even be listed, but how frustrating is it to possibly be holding the info you are needing, and not know where to look? Then again maybe not! 
 Anyone on here who knows the right people should mention this bit of oversight, and hopefully make future editions much better.
Just a somewhat related thought.
 Sorry, I could not help actually identify the cue. Good luck
Jw