The only markings on it are "Esterbrook" on the clip, and "Esterbrook 9668 Made in USA" on the nib. It's a dark chocolate brown, almost black, with silver-tone (I'm assuming nickel?) fittings. The cap is silver-tone with a brown top. The body of the pen is brown with a silver-tone ring where the section joins the barrel, and another at the base of the barrel. The lever is on the side of the barrel rather than the top, and has no markings. It is also silver-tone.
Sorry for not posting pics... my camera is being cantankerous tonight.
Does the description ring a bell for anyone?