Elgin paper label identifies it as a phone base. Measures just under 6" diameter.
PREVENTS SLIPPING
REDUCES NOISESFOR BOTH STYLE PHONES [Upright or Cradle]
RUBBER NOVELTIES, INC.
CUYAHOGA FALLS, OHIO
Ad on front promotes:
BLUE PRINTING
PHOTOSTATS
Fred Wagner Co. MAin 1990
Note that these are vintage and the rubber has hardened somewhat. I installed one by removing the paper label and heating the base gently to soften it. There are absolutely no guarantees that these will install without cracking. Sales are final. Feel free to ask questions.
Have several. Most likely were never used.
Offers by PM or email considered.
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Will also consider suitably higher offers for the Western Electric and Williams & Bridges rings shown in the last image.
More images of a Blue Printing base.