This is a Conklin Nozac model C-59 7M Word Gauge Jet Black piston filler c. 1936. This 5 1/8 inch long model is an interesting combination of a ten faceted cap and lower barrel and a rounded clear ink view upper barrel. The two barrel pieces are threaded and sealed together. The C-59 Nozac was also available in marbled Red Pearl and Green Pearl and sold for $7.50. The markings on the ink view window indicated how many thousands of words of ink was left in the pen. This pen features the 14 karat gold two-tone Toledo nib shown in advertisements in 1935 but with the 1936 new patented clip. There is no inlaid crescent on the cap as on earlier models. Nib grades offered were extra fine, fine, medium, coarse, stub medium, stub broad, left oblique, two way and Recorder in extra fine, fine and medium.