When the Hooters Casino was purchased by OYO they started using temporary slot cards and it now appears there are at least 2 variations of the card with different printings of the front design. The first reported card had a larger OYO logo that was BELOW the top insert arrow. This newly reported card has a smaller OYO logo that wsa moved up on the card and extends above the top insert arrow. I don't have either card myself so I can't provide any actual measurements on the logo sizes right now.
Here's scans of the two cards we currently have documented...