|Note_en=Advertising for an early [[Duofold]] model in [[RHR|red hard rubber]] without cap band, mention the inner cap ''[[Safety Seal]]'' system to prevent ink leaks. | |Note_en=Advertising for an early [[Duofold]] model in [[RHR|red hard rubber]] without cap band, mention the inner cap ''[[Safety Seal]]'' system to prevent ink leaks. |