Some kind of lid/cover, dial.

[qaela4]

Granite/stone/ceramic, it weighs 1.8oz/51g and is 1 5/8 inch diameter, 3/4 inch thick. On the top it has a hole with an outer indent for a cover or knob? Just off center is an indent with an X or maybe clover? On the bottom there is the recessed oblong groove. On the side it appears to be some letters, two top ones that are cut off and two lower ones that may be a K and an E with the number 97. Any help would be greatly appreciated. Thanks in advance..Q.

 

[jewelerguy]

looks like an antique ceramic base for a rotary light switch