Parker Duofold Special Long blue LapisLazuli celluloid body and cap has factory imprint " DUOFOLD SPECIAL GEO.S.PARKER - LUCKY CURVE -FOUNTAIN PEN- JANESVILLE WIS. U.S.A. PAT. 4-25-II" with the Danish anchor symbol plated gold clip and double cap ring flat top original 14k gold nib size Fine Christmas tree feed button filler year of production 1928-33 cc. Made in U.S.A. for Danish market long 135 mm capped long 160 mm posted serviced and restored with a new ink sac excellent condition and still write well for almost a century, a piece of craftsmanship that crosses time and that can give much pleasure in writing The Duofold was undoubtedly the pen that allowed Parker to go from being a small pen manufacturer among many to one of the industry's leading players. Over ten million units were sold and exported worldwide. Produced at the Janesville factory until 1933, Duofolds continued to be produced successfully in England and Canada until the 1940s, sometimes in interesting colors not available in the American Duofold line.