The entire ashtray is smooth, inside and out. Great condition, no chips or cracks, no marks in the bottom from previous use as a keyring holder. If you look very closely, there is the Anchor Hocking symbol in the corner. See the last pic for close up.
Dish is 6 inches (15 cm) square by 1.5 inches (4 cm) tall. All packaged up for shipping, it weighs 2 pounds.
All of my China and glassware has been washed in the sink, by hand, with soapy water. I do not use a commercial dishwashing machine. Sometimes elbow grease is necessary to remove years and layers of grime. Dishwashers cannot do that. Any chips or cracks are noted in the listings.