|Note_en=stands for '20s. Advertising for the [[Duofold]] model in an uncommon version marked ''Duofold Special'', mentioning the [[Lucky Curve]] [[feeder]]. | |Note_en=stands for '20s. Advertising for the [[Duofold]] model in an uncommon version marked ''Duofold Special'', mentioning the [[Lucky Curve]] [[feeder]]. |