1950 Lincoln All Season All Weather Comfort Sales Folder with Note. Tune in Year 'Round (Comfort, Health, Safety) with your Lincoln Fresh-Air Heating and Ventilating System. In Winter...tune in Pleasant Warmth...and Safety. In Summer...tune in Positive, Fresh-Air Ventilation. Back of Folder shows how the Heating and Ventilating System Works. Important note included to Insure Proper Heater Operation. Condition: Looks like a bit of red crayon scribble on cover of folder. See pics.