They are glazed with a matte finish, have a raised unglazed number, and are kiln-fired. They have long been sold out, out of production, and very hard to find.
Heath Ceramics x House Industries: Eames Font #7 Square Tile Number Address Gray
Heath Ceramics House Industries: Eames Font #8 Square Tile Number Address
Heath Ceramics House Industries: Eames Font #9 or #6 Square Tile Number Address
Vintage Edith Heath MCM Ashtray 3 Slot Heath Ceramics Ashtray Olive Green 4.75"
Vintage Heath Ceramics Ashtray - 3 Slot/Notches 4 3/4" Green MCM Pottery Dish
Heath Ceramics Vintage Large 8" Ashtray Teal Turquoise Speckle Glaze 4-Notch MCM
