Here is a cool set of 3 antique Coors crucibles! They are from the earlier 1900's and were used at the Katharine Cook school of Nursing; they were in with other antique medical items at an estate.
If you look on Wiki, there is a very interesting article about her---she was British & founded African nursing and maternity schools from around 1897- 1932.
These are 3 small ceramic Coors crucibles; largest measures 4" top dia., 3 1/4" dia., and smallest 2 3/4".
One shows the label stating Nursing School of Katherine (sic) Cook. (She actually spelled her name Katharine.)
These show some light wear around the tops as per age and use.
Coors was a world standard for Medical ceramics and was used worldwide.
Let me know if you have any questions!