The chips are on the guide already (have been for a while) and it is well known that they were the original roulette chips from Playboy 1966. According to Tom's book, T.R.King verified to him (so I haven't seen the paperwork) that they were made for Playboy and he even goes as far as stating how many were produced so........He wasn't sure why an unusual amount were made (250 - 700). Or why it said PB not P as you say but......Info taken from the 2005 edition. Hope this helps and is useful.
Make a note as this will disappear soon.