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[[Image:1924-08-Conklin-Endura-Student.jpg|thumb|left|An [[Endura]] AD's of 1924.]]
The last [[Conklin]] important model was the [[Nozac]], designed by ''Louis Vavrik'' and introduced in []. [[Nozac]] is the only American pen equipped with a [[piston filler]]; it had a transparent tank with large ink capacity (further highlighted, since [], by the ''word gauge'', a scale that measured the number of words remaining). The pen, produced in beautiful color and with a multifaceted body, is one of the best model of that time, but the mechanism, derived from that one of a mechanical pencil, was not particularly robust and efficient and the pen did not have the success that it would have deserved. In [] a [[plunger filler]] version of [[Nozac]], called [[One Stroke]], was produced.