This is a square ceramic 'box' that is 2 cm by 2 cm on the surface and about 1cm X 2cm on the sides. It was found in Detroit at a site dating back to the early 1900s. On the surface are the letters 'R&S' underneath is 'Rd No 47843'. We believed it may be a component to something electrical in nature but have been unable to find anything it would belong to. Link to the photo is below:

http://i1382.photobucket.com/albums/ah242/kristaeggleston/Yeoldcomputerkeyinfield_zpsc9f5c592.jpg

Thanks in advance for the help!