A design for a "Paperweight, Match-safe, &c." was patented by James C. Gill of Covington, Kentucky, on March 1, 1887, and assigned to "The Hemingray Glass Company of the same place." The leading feature of the design consisted of "a representation of an anvil set on a stump, or block of wood representing a section of the trunk of a tree, in its natural state, with the bark on-tbe object being to make the article look as nearly as possible like a blacksmith's anvil in position for work, the body of the anvil having a hollowed out receptacle or interior opening at the top. The broad face of the anvil may receive any desired inscription." In the patent drawings the letters "K of L (Knights of Labor) appear on the broadside of the anvil. This glass novelty was produced in crystal, amber, blue, canary, and opal glass.

I know of 3 different colors that this K of L match safe comes in! Amber, Depression Glass Green, Peacock blue (all pictured here!) In theory it could come in a spectrum of colors! All the color of the lamps and the color of the bird dishes! It wouldn't be out of the question to say it could come in 12-16 colors (if you count the different shades of the main colors!!)