This chip is from the first issue after the Flamingo became the Hilton Flamingo.

It is a very fine example, ex the late Audrey Zaslawsky, and I give a guarantee that it has not been altered in any way.
There is a minute fault on the 'I' of Flamingo on one side. The edges are slightly rounded (although it will just about stand on edge) and there are no rim nicks or other faults worth mentioning. The scan is pretty clear, the couple of white specks are on the airtite.

TCR lists this chip as 'S' ($300-$349) in average condition.
James C lists it as $300/$450/$600. I would say it was closest to the middle value.

I paid in excess of $300 for this example in auction.

I will consider any serious offers by email. If I accept I will pay for shipping and insurance myself.