These are a set of three Motawi tiles. I was so pleased to find a set that would work well with our decor. I think these will wind up in our foyer, where we have an autumnal theme.
Here is the back of the Motawi tiles. You can see the stamp, plus the notch for hanging. Additionally, the artist who (painstakingly) glazed the tile has signed the back. My guess is that they used an underglaze pen.