Soma 25 Years Paperweight

I am not sure if this is a paperweight or a coaster, or part of a set. It is very heavy brass with a light cork back. There is a brass inset with Soma 25 Years (Carisoprodol). It measures 3 3/4 inches in width. Shows minor aging to the surface. Additional photos by email. I need your zip code to calculate the postage.