Rare Find Vintage Giant Bayer Aspirin Pill Paperweight 1980s

Some minor cut and chips, lots of yellowing spots due to the age, but gives it a vintage looking. Please see pictures for details.

Measurement approx. 7" diameter, 1 1/2" height

It is either made of Plaster or Chalkware? It is a heavy piece, about 2lbs8oz, an effective paperweight. They are no longer in production, and were once used as promotional give out to doctors and pharmacies. 

Thank you for viewing.