The owl is 15/16” square, doesn’t quite fit in medium measure, all others are NBS medium, in new condition.
These terra cotta and white earthenware buttons were hand made in England using a triple firing process. The first firing is to about 1800 degrees centigrade to “biscuit” fire the raw clay. The buttons are then painted with a glaze and fired again to about 1100 degrees centigrade to melt the glaze to a glossy finish. A specially created ceramic transfer is then applied and the button is fired a third time. This firing allows the decal to sink into the glazed surface and become an integral part of the button. There is a lot of potential for things to go wrong so opening the kiln can sometimes reveal a surprise!