Used since the 1960s. Fountain pen and ballpoint pen. Old models: Sterling Silver Sonnet 75 and 51. The Sonnet is different from the currently sold model and is not even listed in the current catalog. It's a Sonnet that only those in the know are familiar with. The design allows you to fix your fingertips and adjust the nib to your preferred angle. The writing feel is superb. You can start writing immediately the moment you remove the cap and hold it. The grip is excellent.