When I got into the wonderful world of collectible writing instruments (mostly mechanical pencils), I learned phrases such as 'This is one of only three known examples' or 'This is the only known example', etc. 😃 Remember 'known' is an important part of these sentence structures. Today I'm showing the only known example of a Tibaldi mechanical pencil. Tibaldi made quality fountain pens in Italy from approximately 1916 into the 1960s. The pencil shown here is made of celluloid trimmed with gold-filled metal. It was made in the 1920s, possibly early 30's.  The piece is 4 7/8 inches long.