One of the largest chips made for actual play in a Nevada casino... the Dunes $25,000.

Gold course picture on inlay so not as hard to find as you might think for a $25K chip. Still worth a few hundred. I believe it is 50 mm diameter.

I collected baccarat so had quite a few oversize chips. Here are a couple of C.J.Sisk samples of the oversize chips:

Note the inverted H&C mold. Paulson used the big hat mold for their oversize chips. These samples had a true hologram in the center. There were just a few of the real hologram chips made for Nevada casinos, including Tropicana and one of the Laughlin casinos. Sisk only marketed their chips outside Nevada even though they were owned by Paulson.