FYI, The Achille Lauro Casino $2.50 cruise ship chip in the Ebay auction appears to have a sunburst cancel on it.
I have a notch-cancelled example of this chip, and it doesn't have the sunburst imprint in the center area of the chip. If the sunburst design was part of the final chip design, then my notched chip may have been a prototype(?). The chip has 3 notches, but is otherwise new condition. Same on both sides.

If anyone's interested in the notched chip, send me an email with offer. [I'll be out most of the day, but will respond to emails tomorrow - Saturday.]

For comparison, the Ebay chip image is first, followed by my notched chip: