The coin you are showing is the center element of a $1 gaming chip from the Desert Inn. The style of chip is referred to as a Coin-in-Center chip, CIC.

You only have the CIC.

Here is an image of the complete chip, from the MoGH's ChipGuide.

CIC type chips are known to have breakage of the outer ring, or purposeful removal from the rings. These are very common.