The screw-telescopic system originally goes back to Luxor (H. Herborn), who developed corresponding mechanisms of hard rubber or aluminium. Reform made push-telescopic mechanisms which, however, deviate structurally. Montblanc itself did not invent the telescopic system but only contributed to the further development of the guidance; according to current knowledge, Montblanc is today the only provider with a brass telescope fitted in this form. An identical mechanism of other current brands is not known.