okay, the ps15 is supposed to have a speed joint.
This cue comes close to many dif ones, but does not match any in the book exactly. Obviously, it is most likely a custom variation, either changing the joint or wood/inlay material combo. The rings also vary between models.
It is a signed "professional series" not a JP series ( which are a bit cheaper).
Okay correct me if I am wrong(it looks dif in dif pics and lighting) but it appears that your cue has
birdseye maple forearm, synthetic ivory points (outlined in cocobolo (or bacote?), ebony bordered mother of pearl diamond inlays and dashed rings.
Assuming I have that right, the CLOSEST one in my opinion would be the
PR10 ( though they came with the speed joint).
This is kinda a tough one to nail down exactly.
Actually, looks like a variation of the P23 though the P23 has rosewood points. Everything else seems to fit.
"professional series" - the following professsional series cues all featured 5/16-14 piloted SS joints with nickel siver rings in the joint collars.
Everything seems to match exept the point material. The original retail of the P23 is $900 (1996). cond 98%= $1,025, 90%= $775, 70%= $500.
Again this is my best guess going by the blue book. Wish I could have been more definitive.