Refill for Caran d'Ache 849 Ballpoint Pen.
About Caran d'Ache:
Founded in 1915 in Geneva, Caran d'Ache was originally known as Fabrique Genevoise de Crayons, but it was rebranded to Caran d'Ache, which means pencil in Russian, in 1924. Probably most famous for their pencils and colored pencils, the company has a long history in making some of the finest writing instruments.