South Dakota, USA
Clayburn Pottery ended in 1960.
I have a small Haddon Pottery pot and the pottery name - Haddon Pottery - is handwritten in full on the base.
Black figure pottery was the style of pottery in which figures were painted in silhouette. Red figure pottery became popular after black figure pottery. In red figure pottery red paint is used on a black background.
I believe you mean Alan Long pottery from Clay pond pottery
The pottery mark CPNP stands for "Crown Pottery Newcastle Pottery." This mark was used by the Crown Pottery Company, which was located in Newcastle, England. Pottery marks like CPNP are used by manufacturers to identify their products and establish authenticity and provenance.
Gladys Cromwell has written: 'Poems By Gladys Cromwell'
Gladys Blake's birth name is Gladys Timmons.
Gladys Brockwell's birth name is Lindeman, Gladys.
Gladys Atwater's birth name is Gladys Valerga.
Gladys Field's birth name is Wesley, Gladys.
Gladys Hanson's birth name is Snook, Gladys.
Gladys Johnston's birth name is Gladys Johnson.
Gladys Henson's birth name is Gladys Gunn.
Gladys Gale's birth name is Gladys Lanphere.
Gladys Lehman's birth name is Gladys Collins.
Gladys Love Presley
Gladys Hall has written: 'Gladys Hall, teaching school'