sentences:  In 1906 the Certina brand name was used for the first time, with Adolf and Alfred choosing to call their watches "Grana", the short form of "Granatus", the Latin name for Grenchen.In 1938 the company adopted the name "Certina", taken from the Latin "certus", meaning "assured", "certain", as their trademark for the export and marketing of their watches.In 2014 Certina changed their red logo with a new logo.