You have what looks like a standard 3/8x12 joint. I am not 100% sure on that. However, I found that you have a J&J model 5549 pool cue (or a very close model to it).
The full catalog page from J&J showing your cue from 1999-2000 is below. They described this line of cues:
Gotta love the description J&J gave to this line of cues (which does confirm the joint type):
J&J 5549 Pool Cue - $89
Veneer Points, Inlays, & 3/8x12 Pin type.
Fancy cues with hand crafted points, inlays, and/or Veneers.
With high quality materials and delicate workmanship, but at affordable price, these cues are the best valued cues you can find.
Oh yes, they are so fancy! (I joke, but actually, at $89 bucks it was a really decent cue).
NOTE: this info is based on the best of my very flawed and incomplete knowledge, and is definitely not a guarantee. As such I can take no responsibility if it turns out to be incorrect.
If you must be 100% guaranteed, you can always reach out to J&J for the authoritative answer:
J & J AMERICA BILLIARDS INC
The full catalog page: