|Note_en=Confirmed by the advertisement on the back of the ''Chrysler Imperial 80'', introduced in 1926, a google books search gives two results for this year. Advertising for a [[Waterman 55|55]] model with mechanical pencil referring to the ''[[rippled]]'' hard rubber, called ''[[Ripple-Rubber]]'' and to the ''[[Treasure Chest]]'' packaging. | |Note_en=Confirmed by the advertisement on the back of the ''Chrysler Imperial 80'', introduced in 1926, a google books search gives two results for this year. Advertising for a [[Waterman 55|55]] model with mechanical pencil referring to the ''[[rippled]]'' hard rubber, called ''[[Ripple-Rubber]]'' and to the ''[[Treasure Chest]]'' packaging. |