Has anyone seen one of these before?

It is, apparently, a shaving mug (a central hole in the removable top), straight sided (despite the angle of the photo which makes it appear otherwise) and just under 30cms (4 inches) high.

It  has, as you can see, the insignia of the old Salisbury Infirmary, and underneath a particular manufacturer’s mark of Keeling and Company of Burslem, which indicates that the mug was made between 1880 and 1936.

It is an item unknown at the museum and not recognised by the archivist at Salisbury Hospital. Was it made to be sold at a fund raising event? Was it used within the hospital and appropriated by a patient?

Any thoughts?