I have to disagree with the above...the more I look at this it seems like an early Paul Rubino cue. I recognize the ringwork and 3/8 10 pin as his style and he liked to match ivory joints and buttcaps like this. Nice design well executed...again, Rubino, but I could be wrong. Also many of his early works were not signed...Matt D.
A bump for other guesses. I sent an email to Paul Rubino, but have not heard back. I might have to check it out in person, but from the pics it does seem to be a well made cue.